I am to understand that it will not run on OSX 10.12 anymore?
Epic, are you aware of this?
Not even starting the Launcher as Admin?
UPDATE!
We have just released Preview 3 for 4.20! Thank you for your continued help in testing the 4.20 build before its official release. As a reminder, the Preview builds are for testing only, and should not be used for the active development of your project.
For a list of known issues affecting this latest preview, please follow the links provided on the first post in this thread.
Fixed in Preview 3
Fixed! UE-59914 Editor freezes after reimporting alembic asset
Fixed! UE-59473 Handled ensure occurs in Orion -game - CurrentTime >= 0.f && CurrentTime <= SequenceLength
Fixed! UE-53444 If the entry of State Machine of AnimBP directly connect a state which has another state machine, a crash will occur when changing parameters of AnimBP
Fixed! UE-60412 Editor freeze with cyclical recursion with Set Pose Component
Fixed! UE-59957 MasterPoseComponent can be chained, breaking assumptions about pose. Bad poses or crashes resulting.
Fixed! UE-60546 Crash calling Set Sound Wave on Synth Sample Player component in blueprint
Fixed! UE-60471 Synth Sample Playerâs Set Seek Time is broken.
Fixed! UE-60448 Crash occurs when switch from map to Lighting map in content examples with Audio.h
Fixed! UE-60297 Unable to GenerateProjectFiles with Visual Studio 2015
Fixed! UE-60326 [CrashReport] UE4Editor_Core!FArchive::SerializeCompressed() [archive.cpp:696]
Fixed! UE-53522 GitHub 4344 : Remove .version file
Fixed! UE-60442 Editor Toolbar Button plugin with âIs Engine Pluginâ enabled fails to compile, â-moduleâ argument could not be found
Fixed! UE-60415 Third Party Library plugin creation fails, âExampleLibrary.hâ file not found
Fixed! UE-59713 Mac: iOS Fails Build Step for Clang Error: âframework not found AccountKitâ
Fixed! UE-56325 Packaging copy of QAGame for Android fails with clang error
Fixed! UE-60619 nDisplay template is missing from the promoted build
Fixed! UE-60078 Cannot successfully create a local binary build of the Engine that includes iOS
Fixed! UE-60190 Generate Project Files fails with Visual Studio 15.7.3 if NuGet package manager is not installed
Fixed! UE-60447 UHT is being rebuilt with VS2017 despite passing -2015 to UBT
Fixed! UE-59750 UnrealMatch3 fails to build for iOS with error about modifying value of bCompileForSize
Fixed! UE-60256 Reduce size of VirtualCameraSample project
Fixed! UE-59993 Match 3 display is slightly off screen on some android devices
Fixed! UE-59939 ElementalDemo Landscape map is failing to load as sublevel
Fixed! UE-59907 ARPG - Detail lights too bright on sphere reflection captures
Fixed! UE-60453 ARPG - Fix initial camera rotation on delayed player restart
Fixed! UE-60340 ElementalDemo is a now a Code project for Release-4.20
Fixed! UE-59445 Product Viewer Template
Fixed! UE-59042 VRed importer
Fixed! UE-59748 Intermittent failures when trying to import Datasmith files in Unreal Studio Projects - Entitlement check failure
Fixed! UE-60571 Datasmith plugins are causing certain XR projects to crash on launch
Fixed! UE-60400 Crash occurs Launching C++ project onto Lumin with Unreal Studio plugins enabled
Fixed! UE-58920 nDisplay template
Fixed! UE-56573 [CrashReport] Reimport crash - Objects have the same fully qualified name but different paths
Fixed! UE-59412 Many faces flipped after IGES files import
Fixed! UE-58742 Mesh not found after CAD import of 3dm file
Fixed! UE-58387 Datasmith CAD cannot reimport mesh if it has LODs
Fixed! UE-59064 Crash importing Datasmith file through python using garbage content destination
Fixed! UE-59752 Mouse hover performances in mesh editing
Fixed! UE-60270 Datasmith importer - Material not compiling and Textures corrupted after first material with normal map
Fixed! UE-60173 Cooked game crash with asset imported from datasmith - Serial size mismatch
Fixed! UE-60452 Importing object with multi-material from datasmith is broken
Fixed! UE-59189 SketchUp Installer list SketchUp 2017 and 2016 but we compile only 2018
Fixed! UE-59683 Overlapping UV on Sketchup datasmith Import
Fixed! UE-60318 Light baking produces splotchy results with highly tessellated SKP models
Fixed! UE-60174 Light baking produces incorrect results with SKP models
Fixed! UE-59975 Textures with png alpha loses its transparency
Fixed! UE-60564 Missing latest improvements from Sketchup plugin
Fixed! UE-60413 Canât launch a game with DatasmithFBXImport plugin (VRed/Deltagen) enable
Fixed! UE-60024 Cannot load asset created by Sketchup in Python
Fixed! UE-48433 [CrashReport] UObjectBaseUtility::IsA | UObjectProperty::SerializeItem
Fixed! UE-60359 FLevelCollection::RemoveLevel crash after reverting a change to a sublevel
Fixed! UE-58366 [CrashReport] UE4Editor_Engine!FLevelCollection::RemoveLevel() [world.cpp:249]
Fixed! UE-60544 User has option to rename imported Gameplay Tags, causes crash
Fixed! UE-60598 Incorrect toast response when trying to delete gameplay tag with children
Fixed! UE-59182 Build failure after nativizing any child Blueprint class (regression).
Fixed! UE-60119 Build failure after nativizing any child Blueprint class with function override (regression).
Fixed! UE-60337 [CrashReport] UE4Editor_Kismet!FBlueprintInterfaceLayout::OnClassPicked() [blueprintdetailscustomization.cpp:5102]
Fixed! UE-60656 Users are not warned that compilation manager will be mandatory in 4.21
Fixed! UE-58244 Editor crash when reparenting blueprints: FInitBodiesHelper<1>::FInitBodiesHelper<1>()
Fixed! UE-60455 Comment Box Font Size Does not update until compiled or saved
Fixed! UE-60456 Comment bubble does not appear with âShow Bubbleâ enabled
Fixed! UE-60570 Watch windows will not list any watched values from before being opened
Fixed! UE-59393 Fix unreal console connection to Lumin platform
Fixed! UE-58595 Crash when saving a UEDPIE level
Fixed! UE-58594 Rename crash when performing ServerTravel in PIE
Fixed! UE-58601 Crash when traveling to a ShooterGame match after failing to spawn in a previous match
Fixed! UE-29969 Crash when Removing and adding players on client
Fixed! UE-55838 Crash playing in viewport with more than one player
Fixed! UE-57173 Server RPC with struct param containing class reference does not pass parameter
Fixed! UE-59511 Warnings when entering lobby: "StaticMeshComponent0 has physics bodies outside of MBP bounds "
Fixed! UE-58813 Destructibles are not rendered correctly when fractured if Support Compute Skincache is enabled
Fixed! UE-60062 UnrealFrontend Quick Launch fails
Fixed! UE-60032 Log<Platform>: Warning: Attempted to use GamePersistentDownloadDir(), but CacheDataSizeKB wasnât specified in <Platform> Project Settings
Fixed! UE-59303 Apex/Physx need to generate *.sym files for new crash symbolicator
Fixed! UE-59721 Windows to Linux Launch On fails from a binary build - clang++.exe: error: linker command failed with exit code 1
Fixed! UE-60045 Hot Reload/Compile button in Editor fails: UBT ERROR: Failed to produce item
Fixed! UE-60639 Unix platform does not set current working directory to the base
Fixed! UE-60668 Linux: Packaged Games and Launch-ons have no audio
Fixed! UE-60257 KeyUp triggers us hitting the disk
Fixed! UE-59252 Mobile Temporal AA is broken
Fixed! UE-59486 IOS crashing on open on iOS 9 devices - uncaught exception âNSInvalidArgumentExceptionâ
Fixed! UE-59408 Enabling Preview Rendering Level Mobile GLES3.1 on Map With Vector Fields Results in Editor Crash
Fixed! UE-58811 Enabling RenderDoc under Android Project Settings breaks RenderDoc 1.0
Fixed! UE-58585 Modulated shadows in Mali device, ES3_1, movable object leads to shadow artifact when moving camera
Fixed! UE-59715 iOS fails to build in DebugGame configuration: symbol(s) not found for architecture arm64
Fixed! UE-60044 Very large frame time increases on Android Adreno GPUs (SunTemple)
Fixed! UE-60308 Software occlusion and hardware occlusion queries should be mutually exclusive
Fixed! UE-59871 iOS: UE4 Apps are not Allowing Device to Auto-Lock While They are Open
Fixed! UE-59822 App icons and Launch images are displayed as standard iPad Retina icons and images on some iPad Pros
Fixed! UE-58014 Mobile tonemapper permutations need to be refactored
Fixed! UE-57252 GitHub 4631 : Fix one iOS Package Bug.
Fixed! UE-57136 Assertion failed: InWindow when starting Android app with phone awake but screen locked on Galaxy S9
Fixed! UE-60264 iOS Launch-On rebuilds every time
Fixed! UE-59139 Mobile Static Lighting isnât working properly
Fixed! UE-59231 Built Lighting for Rectangle lights does not match movable lighting
Fixed! UE-59334 Incorrect render target index assignment in GLSLBackend
Fixed! UE-59058 Windows OpenGL Launch on of TM-ShaderModels has excessively bright light Near Hair Model and Cloth samples
Fixed! UE-59720 Warning: Referenced Directory Engine/Source/ThirdParty/mtlpp/mtlppâ7efad47/interposeâ does not exist does not exist
Fixed! UE-60255 Black artifacts over specular reflections on SkinNoHead material used in TM-ShaderModels
Fixed! UE-60201 Static Mesh with High Precision Tangent Basis enable gives bad lightmap
Fixed! UE-60184 Directional Light settings remain from previous level when creating new level when using forward rendering
Fixed! UE-59551 Content Examples Basic Decal does not render with color
Fixed! UE-59523 DX12 warning opening sample projects, Warning: NumQueriesInBatch is not used in FD3D12QueryHeap::StartQueryBatch()
Fixed! UE-60488 Ensure selecting an actor with a vector field
Fixed! UE-60380 Crash when running Editor with -vulkan - Error: Runnable thread RHIThread crashed.
Fixed! UE-60368 Crash after setting screen percentage when running Vulkan - Error: Runnable thread RHIThread crashed.
Fixed! UE-53617 Regression: âPlay particle effectâ anim notifies are not seen in the editor playing level sequence/matinee when Attached is set to false
Fixed! UE-60307 GCurrentNumDrawCallsRHI incremented twice per-drawcall in development
Fixed! UE-60663 The reflection examples in TM-ShaderModels are reflecting a black sky
Fixed! UE-60508 Enable HDR Display Output on Game User Settings Crash
Fixed! UE-60353 Auto Compute LOD Distance doesnât properly change screen sizes
Fixed! UE-60002 Save sequence with Geometry Cache causes GLEO
Fixed! UE-60351 Sequence Name does not update when duplicating group
Fixed! UE-60345 Sequence recorder group actors arenât always saved
Fixed! UE-60322 Crash Occurs When Light is Added to Sequencer and Light Component is Keyed
Fixed! UE-59861 Right click menu in tree view has paste button grayed out
Fixed! UE-59820 Crash garbage collecting after saving a sequence with a duplicated binding
Fixed! UE-60631 Missing Burn In Settings in Render Movie Settings
Fixed! UE-60568 Unable to call several functions in UMovieSceneParameterSection due to them not being exposed outside of the module
Fixed! UE-60472 Currently open level is not marked dirty upon adding a possessable actor to a level sequence
Fixed! UE-60511 Play reverse continues looping
Fixed! UE-60487 Convert a spawnable to a possessable should retain the name of the spawnable
Fixed! UE-60606 Crash in MovieSceneImpl::RestorePreAnimatedToken() due to null state token
Fixed! UE-56340 Animation sequenceâs ParticleNotify doesnât fire while playing it back in Sequencer editor
Fixed! UE-60213 Moving subscenes is not invalidating evaluation templates
Fixed! UE-60686 Tracks referencing the same sequencer donât work properly in package build
Fixed! UE-60269 Curve Editor help text is no longer present
Fixed! UE-60333 [CrashReport] UE4Editor_CoreUObject!StaticFindObject() [uobjectglobals.cpp:314]
Fixed! UE-60271 Curve Handle art assets are missing
Fixed! UE-60172 Warning: Unable to find Slate Widget Style âGenericFilters.TextStyleâ when opening visual logger
Fixed! UE-60646 UV Preview in Static Mesh Editor stretches to fill the entire Viewport on Mac
Fixed! UE-60588 Reimporting a mesh with a user-created Material Slot removes the option to delete the custom Material Slot
Fixed! UE-57837 GitHub 4664 : Set Password on EditableText
Fixed! UE-60500 Staticmesh LODs custom SectionInfoMap give a different material mapping, build versus load
Fixed! UE-60164 Crash os saving scene on the opening level
Fixed! UE-59132 Crash in UHierarchicalInstancedStaticMeshComponent::GetOverlappingSphereCount
Fixed! UE-59033 [CrashReport] UE4Editor_Landscape!ALandscapeProxy::UpdateBakedTextures() [landscape.cpp:2537]
Fixed! UE-57571 Undo action gets Landscape Grass Types per platform controls into broken state
Fixed! UE-60155 Strings unlocalizable in 4.20 Preview 1
Fixed! UE-60550 Crash when using Find in Blueprints with String Table references
Fixed! UE-60642 Modifying Curve Atlas Texture Size changes the curve index used by Material Instances
Fixed! UE-59168 Capturing a particle systemâs current attributes can be a little awkward and confusing
Fixed! UE-60128 [CrashReport] VCRUNTIME140!MoveSmall() [memcpy.asm:306] - UE4Editor_Niagara!FNiagaraParameterStore::Tick
Fixed! UE-60281 Users can crash the editor when making unexpected edits to the emitter and system graphs.
Fixed! UE-60252 Niagara and Cascade systems not rendering in simulate.
Fixed! UE-60320 [CrashReport] UE4Editor_NiagaraEditor!UNiagaraStackFunctionInput::CanReset() [niagarastackfunctioninput.cpp:978]
Fixed! UE-60240 Cross talk between Niagara system sims
Fixed! UE-60245 Spawned particles on the surface of a static mesh in Niagara get offset if the actor is anywhere but the world origin
Fixed! UE-59566 Opening an asset performs undoable actions.
Fixed! UE-59613 Crash when swapping back and forth between CPU/GPU and editing parameters
Fixed! UE-59518 System/Emitters should call Spawn and Update on frame 0
Fixed! UE-60569 Attempting to import TMapImport_CSV locks the editor - Couldnât unpack vector found at character 38 in the first row
Fixed! UE-60473 Assert deleting Color module in a Niagara Emitter
Fixed! UE-60460 Crash when editing metadata on a module with an edit condition which was added in an open system.
Fixed! UE-60580 Crash when changing the color of after changing the particle sim target
Fixed! UE-60574 Importing a CSV asset with a TSet Material auto imports as a Houdini asset with no Data Table options window
Fixed! UE-60377 Crash when undoing a deactivation of a module in a System
Fixed! UE-60373 Undo the deactivation of a module does not re-enable the module
Fixed! UE-60374 Skeletal Mesh Log Spamming for Every Asset Unnecessarily
Fixed! UE-60369 Linux - EngineTest crashes with error: LogCore: Error: appError called: Assertion failed: InState >= ENiagaraExecutionState::Active && InState < ENiagaraExecutionState::Num
Fixed! UE-60366 Crash when deleting CurlNoiseForce Module from Emitter in Content Examples
Fixed! UE-60357 Crash when undoing deletion of Beam Emitter Setup module from DynamicBeam Emitter in Content Examples
Fixed! UE-60355 Crash when value for Emitter Life Cycle NextLoopDuration exceeds 36000
Fixed! UE-56008 Crash when deleting a Color for Curve parameter from a collection that is in use in a Emitter Stack
Fixed! UE-59996 SpawnBurstInstantaneous Random Int causes VM crash
Fixed! UE-60243 Error executing a script with white space in is name or path - invalid syntax
Fixed! UE-60316 [CrashReport] UE4Editor_UMGEditor!SWidgetDetailsView::GetNameIcon() [swidgetdetailsview.cpp:380]
Fixed! UE-60073 Performance UI Frames display does not update
Fixed! UE-59574 Set up AutoSDKs for Lumin/Mac
Fixed! UE-60399 QAAR fails to cook
Fixed! UE-58187 MR - All MR plugin content needs to be saved with a non-zero version number
Fixed! UE-55807 Packaging GoogleVR fails due to missing binaries
Fixed! UE-54250 Disable MR calibration debug cheats
Fixed! UE-58873 FaceARSample - Crashes on app launch
Fixed! UE-60520 GoogleVR projects are crashing on launch - Assertion failed: bMemorySizeReady
Fixed! UE-60177 Extremely low FPS while running a project with -game
REMEMBER: Please report any new bugs you find by following the How To Report a Bug Guide
Having a great experience with 4.20 so far. Any idea for an expected release date?
Also looking forward to the updated Shootergame project using the newly added UReplicationGraph 
Apparently Epic is not reading forums that carefully and often as you expect. If you have issues which are reproducing stably, do the following to help to solve it ASAP:
- Create a small sample project which reproduces bug.
- Report it according to instructions: Report a Bug - Unreal Engine
- Write exact steps to reproduce and as much details as possible.
Obviously guys are extremely busy with reported bugs and are not browsing forums in search of extra work.
In my case, both forum message and Answerhub question seemed left unnoticed by everybody, but after reporting a bug, Epicâs stuff contacted me promptly and actually helped with my!
Multiple people have been reporting this, every single created from the reports was wrong.
Canât package a plugin (even blank) with source code in 4.20.0 Preview 2 and 3, although it can be compiled in Development or Shipping config in C++. Is it just me?
The UE says 4.20 has a release of Q3 2018 which starts in July.
Can you double check that UE number please, searching for âUE-59334â comes up as an Unknown on the tracker.
Is this on Mac? Mac plugin packaging has been broken since 4.15, I reported the but seems like they are unable to reproduce it on their side even tough multiple users have contributed with reports, thereâs a workaround on the comments. Cannot package a plugin in 4.15(Mac) - Plugins - Epic Developer Community Forums
There had already been a couple bug reports that made it to the tracker posted into that thread, but today a report filed a while ago finally made it to the tracker. For everyone experiencing the hitching it has been confirmed present by Epic staff in versions 4.19, 4.20, and 4.21 (so far at least, 4.21 is internal still) please vote on this to ensure Epic knows how critical the is to us, thanks.
No, Windows. It looks like either broken UnrealBuildTool or VIsual Studio installation. Though, I use VS2017 for more then a year, and now I just updated it.
Using Visual Studio 2017 14.14.26428 toolchain (C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.14.26428) and Windows 10.0.16299.0 SDK (C:\Program Files (x86)\Windows Kits\10).
G:\MyDocuments\Unreal Projects\Plugins\Text2LipSync\HostProject\Plugins\Text2LipSync\Source\Text2LipSync\Text2LipSync.Build.cs: warning: Referenced directory 'C:\Program Files\Epic Games\UE_4.20\Engine\Source\Text2LipSync\Public' does not exist.
...]
Using Visual Studio 2017 14.14.26428 toolchain (C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.14.26428) and Windows 10.0.16299.0 SDK (C:\Program Files (x86)\Windows Kits\10).
C:\Program Files\Epic Games\UE_4.20\Engine\Source\ThirdParty\Expat\Expat.Build.cs: warning: Referenced directory 'C:\Program Files\Epic Games\UE_4.20\Engine\Source\ThirdParty\Expat\expat-2.2.0\Win64\VS2015\Release' does not exist.
G:\MyDocuments\Unreal Projects\Plugins\Text2LipSync\HostProject\Plugins\Text2LipSync\Source\Text2LipSync\Text2LipSync.Build.cs: warning: Referenced directory 'C:\Program Files\Epic Games\UE_4.20\Engine\Source\Text2LipSync\Public' does not exist.
...]
Running UnrealHeaderTool UE4Game "C:\Program Files\Epic Games\UE_4.20\Engine\Intermediate\Build\Win64\UE4\Development\UE4Game.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -installed
Reflection code generated for UE4Game in 6,7929523 seconds
ERROR: System.IO.DirectoryNotFoundException: Can't find path "G:\MyDocuments\Unreal Projects\Plugins\Text2LipSync\HostProject\Plugins\Text2LipSync\Intermediate\Build\Win64\UE4\Development\Text2LipSync\Text2LipSync.precompiled".
...]
in UnrealBuildTool.PrecompiledManifest.Read(FileReference Location) в C:\Program Files\Epic Games\UE_4.20\Engine\Source\Programs\UnrealBuildTool\System\PrecompiledManifest.cs:line 37
Iâve been compiling plugins without problems. When I have a problem, itâs always something I did wrong.
So, starting with the basics, is that folder I left on the quote (âŚ]text2lipsync\public) supposed to exist INSIDE the engine folder?
No, of course it shouldnât be in the engineâs folder. As I said, I have a similar error in a blank project with a blank new plugin. âtext2lipsync\publicâ is a path to headers of my plugin. Itâs located inside of the pluginâs sources folder and specified in the build.cs file, as usual.
Me too. And I spent a day trying to figure out whatâs wrong on my side. So, you packaged plugins successfully in 4.20 Preview, is it correct?
Donât reference your own public folder in the build.cs, it will compile fine without it. I had to make this change for my plugins in 4.20
How can I include headers to code files then? To write ââŚ/public/â in every include instruction is wrong. Thatâs exactly what UE4 creates in a new plugin automatically:
using UnrealBuildTool;
public class DemoPlug : ModuleRules
{
public DemoPlug(ReadOnlyTargetRules Target) : base(Target)
{
PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;
PublicIncludePaths.AddRange(
new string] {
"DemoPlug/Public"
// ... add public include paths required here ...
}
);
...
UPD.
Just figured out: I actually can compile if I set a module type as âDeveloperâ instead of âRuntimeâ. But without â-Shippingâ libraries, of course.
UPD 2.
Ok, it looks like the only significant warning before UBT error in the log it this:
tâs looking for VS2015 folder, but I use 2017 for more then a year.
When I compile in Shipping/Win64 configuration in C++, it ends without errors, but doesnât produce -Shipping.lib. I also noticed that UBT command line agruments are changed in 4.20.
Something is horribly wrong with your QA if every preview has over 100 fixes tbh.
Man, thatâs exactly what Preview phase is for. Testing and bug fixing.
If there are bugs reported during âbeta phaseâ, QA works fineâŚ