UPDATE!
We have just released Preview 4 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 4
Fixed! UE-59810 SkelMeshMerge not working for meshes with >1 LOD
Fixed! UE-44910 Skeletons don't cook in a deterministic way
Fixed! UE-60856 Pose Asset crash - update source crash when curve is added
Fixed! UE-60561 Nothing in timeline for Blending_ControlRig sequence
Fixed! UE-60486 Project fails to reopen after adding a feature pack
Fixed! UE-60902 nDisplay icons are not set
Fixed! UE-60870 Once Autoplay has been disabled, it cannot be re-enabled
Fixed! UE-60867 Black squares on ActionRPG landscape on device
Fixed! UE-60758 ActionRPG has outdated UE branding for app icon for Windows
Fixed! UE-60746 Update RemoteSessionApp project to have Simple VirtualCamera sample level
Fixed! UE-60677 Character can be instantly reoriented during some animations
Fixed! UE-60674 iOS has the wrong Launch Image in ActionRPG
Fixed! UE-60675 ActionRPG Android defaults to Vulkan
Fixed! UE-60671 Background is black on devices because fog is not rendering
Fixed! UE-60672 Pillar pops in vision when crossing middle of map
Fixed! UE-60634 ARPG - Android Launch Image
Fixed! UE-60633 ARPG - Blur backups on es3.1
Fixed! UE-60577 Landscape in ActionRPG is default material in Mobile PIE (ES2)
Fixed! UE-60558 VehicleGame launcher sample is missing some default inputs
Fixed! UE-59041 Late feature : MDL/AXF importer
Fixed! UE-59798 Late feature : AJA Media
Fixed! UE-59438 Late feature : Virtual Set sample
Fixed! UE-60898 AjaMedia.uplugin has EngineVersion set
Fixed! UE-60772 Transparency and fading do not work in MeshEditor
Fixed! UE-60723 Import CAD - Crash on re-import after deleting & undo deleting light source
Fixed! UE-60803 Datasmith - Generate lightmap UVs is disabled at import
Fixed! UE-54417 [CrashReport] UE4Editor_CoreUObject!StaticAllocateObject() [uobjectglobals.cpp:2305]
Fixed! UE-60438 When Client Side Navigation is enabled, it is only initialized Server Side
Fixed! UE-59055 Crash occurs when interacting with pop out widget for Debug Filter drop down within the Blueprint editor
Fixed! UE-60254 Rare crash closing the editor after packaging with Nativization enabled
Fixed! UE-60794 Editor crashes when accepting target in Merge Tool
Fixed! UE-60774 Crash opening new level with current level and sublevel blueprints open
Fixed! UE-60759 Crash diffing two blueprint and reloading one of them
Fixed! UE-60661 Match3 fails to package with Nativization for Android, 'Function does not have a parameter named 'MoveType''
Fixed! UE-60873 Crash compiling an Anim Blueprint used in as a Sub Anim Instance twice after changing a variable to Text
Fixed! UE-60872 Crash compiling an Anim Blueprint used in as a Sub Anim Instance twice after changing a variable to String
Fixed! UE-60878 Changing parameter type will lose pin values (but not connections)
Fixed! UE-60711 Reloading blueprint with Diff window open will crash the editor
Fixed! UE-60705 Crash - Triggering a Blueprint Breakpoint Multiple times with the Blueprint Editor closed Crashes the Editor
Fixed! UE-60625 All pins are orphaned on a custom event call node when a pin is changed on the custom event
Fixed! UE-60624 Hang when hosting an online ShooterGame match
Fixed! UE-60584 Crash when doing PIE from Override Binding assets in QAGame
Fixed! UE-60047 SDL2 needs to be rebuilt for armhf (32bit)
Fixed! UE-59943 Linux crash on startup with Cook On The Fly
Fixed! UE-59928 Linux: suppressing -fPIE does not work as intended.
Fixed! UE-60217 User is not prompted to install the toolchain provided by UE4 when generating project files on Linux with an old clang version
Fixed! UE-60858 Unknown project file type 'CLion error when generating project files for CLion
Fixed! UE-60596 TestPAL crashes with MallocProfiler when trying to run on Linux
Fixed! UE-60566 Standard error is spammed with "Used memory before allocating anything was"
Fixed! UE-60398 4.20 modular binaries don't start on a number of Linux distros (Fedora, CentOS, Arch)
Fixed! UE-57836 Crash dragging MaterialImportTest.abc with materials into level
Fixed! UE-60146 Linux: EXR Image Sequences Render Black
Fixed! UE-60767 ARM server fails to build with: undefined reference to SDL_ConfineCursor
Fixed! UE-60242 Android Rendering issues on ARPG in Vulkan
Fixed! UE-59864 RemoteSessionApp has no UE splash (loads with black screen)
Fixed! UE-59576 Blending on meshes in Landscapes umap is not rendering properly in High End Mobile Preview or HTMl5
Fixed! UE-60781 Blackscreen in app on Galaxy S6 SM-G920F
Fixed! UE-60560 iOS: Errors During Build Step with dSYM File Included Due to Space In Project Path
Fixed! UE-58463 Thermals are Nominal message appears on DebugGame and Development iOS packages
Fixed! UE-57315 Match3 Sig 11 crash with GL RHIThread enabled
Fixed! UE-60277 Vulkan -sm5 application fails to load: Error: The global shader cache file SF_VULKAN_SM4.bin is missing
Fixed! UE-59572 Depth' blur needs to work on the new DOF
Fixed! UE-59535 Enabling Support Compute Skincache causes textures to render incorrectly on SK_Mannequin in game
Fixed! UE-59784 Static Mesh LODs are not changing their color based upon distance
Fixed! UE-59425 Movable Volumetric Fog causing black artifacts on Particle Lights
Fixed! UE-60901 DOF: take coc radius error into account when binning gathering sample
Fixed! UE-60854 Diaphragm DOF second coc dilate is not being used
Fixed! UE-60808 Material Collection Not Updated
Fixed! UE-60775 MetalRHI: "FMetalShaderPipeline does not have member named..." errors compiling Test config
Fixed! UE-59307 Add support for Compressed Volume textures in Vulkan
Fixed! UE-60612 Crash in FD3D11DynamicRHI::SetResourcesFromTables
Fixed! UE-57601 ShooterGame menu flashes in Vulkan on Linux
Fixed! UE-53183 Re-do optimization from 3689687
Fixed! UE-56009 Warning: Ambiguous search when launching TM-PhysicalLightUnits
Fixed! UE-60268 Min Roughness light parameter not functioning properly
Fixed! UE-60421 Extremely low frames on Context Examples - UMG with -vulkan
Fixed! UE-60944 PIE after an Undo of an Added Sub-scene causes a crash related to UMovieSceneTrack::GetMaxRowIndex()
Fixed! UE-60736 Using the Create Level Sequence Player node starts the sequence at a Random Start Time
Fixed! UE-60686 Tracks referencing the same sequencer don't work properly in package build
Fixed! UE-60841 Asset Size Mapper window text is clipped when High DPI is enabled
Fixed! UE-60730 Texture Editor viewport glitches when editing adjustment attributes
Fixed! UE-60699 Crash overwriting a recently-saved level
Fixed! UE-60926 Camera Safe frames offset when High DPI Support is enabled
Fixed! UE-60918 Vertices are offset from mesh when Large Verts is enabled with High DPI Support
Fixed! UE-60770 Unable to Reset to Default on various settings in the details panel of Texture Editor
Fixed! UE-60331 [CrashReport] UE4Editor_Landscape!ALandscapeProxy::FlushGrassComponents() [landscapegrass.cpp:1942]
Fixed! UE-48724 [CrashReport] UE4Editor_Landscape!ULandscapeInfo::UpdateLayerInfoMap() [landscape.cpp:1459]
Fixed! UE-48899 [CrashReport] UE4Editor_Landscape!ULandscapeInfo::RegisterActor() [landscape.cpp:1882]
Fixed! UE-51914 [CrashReport] UE4Editor_CoreUObject!FWeakObjectPtr::Get() [weakobjectptr.cpp:81]
Fixed! UE-60642 Modifying Curve Atlas Texture Size changes the curve index used by Material Instances
Fixed! UE-60332 [CrashReport] UE4Editor_MeshEditor!FMeshEditorMode::CreateWireframeMeshComponents() [mesheditormode.cpp:4780]
Fixed! UE-60261 EngineTest - MeshOrientation tests fail with: "Screenshot 'MeshOrientationTests_After Runup' test failed, Screnshots were different!"
Fixed! UE-60877 Renaming and deleting parameters from the system/emitter editor deletes and renames inputs in modules.
Fixed! UE-60874 Crash when editing float function inputs.
Fixed! UE-60847 Curve evaluation doesn't work with interpolated spawn until interp spawn is turned off and on again
Fixed! UE-60669 Renaming an Output Pin within an Niagara Script Details Panel breaks existing connections
Fixed! UE-60548 Crash when redoing after undoing the addition of an emitter to a system
Fixed! UE-53684 Niagara emitters without render modules will have a sprite module created for them when they're added to a system that can't be deleted
Fixed! UE-59114 Widget clips incorrectly when added at runtime
Fixed! UE-60731 Some widget elements render on top of the editor during PIE if they are wrapped by an invalidation box
Fixed! UE-60592 Ensure when force deleting a Widget Blueprint referenced by the level Blueprint
Fixed! UE-60342 Adding the Vehicle code feature pack to a project fails to compile with 'HMD_MODULE_INCLUDED' errors
Fixed! UE-60884 Installed builds fail when ARKit is enabled by default
Fixed! UE-60861 There are seams in the AR environment textures when applied to a skylight
Fixed! UE-60783 ARKit 2.0 Preview Support
Fixed! UE-60556 GearVR projects are not receiving Gear trackpad input
Fixed! UE-53905 Oculus CheckIfPointWithinPlayArea function returns incorrect results
Fixed! UE-51654 SteamVR plugin ignores windowed settings and forces app into fullscreen
Fixed! UE-54455 MR Calibration: When calibrating with Vive, alignment models don't show up
Fixed! UE-57633 ARKit: App Crashes when Swiped Off-Screen after Pressing "Start AR"
Fixed! UE-60756 LiveLink Client Panel not refreshing for sources not added through UI
Fixed! UE-60840 Crash dragging Spline Mesh Actor from modes panel into viewport
REMEMBER: Please report any new bugs you find by following the How To Report a Bug Guide
We have just released Preview 4 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 4
Fixed! UE-59810 SkelMeshMerge not working for meshes with >1 LOD
Fixed! UE-44910 Skeletons don't cook in a deterministic way
Fixed! UE-60856 Pose Asset crash - update source crash when curve is added
Fixed! UE-60561 Nothing in timeline for Blending_ControlRig sequence
Fixed! UE-60486 Project fails to reopen after adding a feature pack
Fixed! UE-60902 nDisplay icons are not set
Fixed! UE-60870 Once Autoplay has been disabled, it cannot be re-enabled
Fixed! UE-60867 Black squares on ActionRPG landscape on device
Fixed! UE-60758 ActionRPG has outdated UE branding for app icon for Windows
Fixed! UE-60746 Update RemoteSessionApp project to have Simple VirtualCamera sample level
Fixed! UE-60677 Character can be instantly reoriented during some animations
Fixed! UE-60674 iOS has the wrong Launch Image in ActionRPG
Fixed! UE-60675 ActionRPG Android defaults to Vulkan
Fixed! UE-60671 Background is black on devices because fog is not rendering
Fixed! UE-60672 Pillar pops in vision when crossing middle of map
Fixed! UE-60634 ARPG - Android Launch Image
Fixed! UE-60633 ARPG - Blur backups on es3.1
Fixed! UE-60577 Landscape in ActionRPG is default material in Mobile PIE (ES2)
Fixed! UE-60558 VehicleGame launcher sample is missing some default inputs
Fixed! UE-59041 Late feature : MDL/AXF importer
Fixed! UE-59798 Late feature : AJA Media
Fixed! UE-59438 Late feature : Virtual Set sample
Fixed! UE-60898 AjaMedia.uplugin has EngineVersion set
Fixed! UE-60772 Transparency and fading do not work in MeshEditor
Fixed! UE-60723 Import CAD - Crash on re-import after deleting & undo deleting light source
Fixed! UE-60803 Datasmith - Generate lightmap UVs is disabled at import
Fixed! UE-54417 [CrashReport] UE4Editor_CoreUObject!StaticAllocateObject() [uobjectglobals.cpp:2305]
Fixed! UE-60438 When Client Side Navigation is enabled, it is only initialized Server Side
Fixed! UE-59055 Crash occurs when interacting with pop out widget for Debug Filter drop down within the Blueprint editor
Fixed! UE-60254 Rare crash closing the editor after packaging with Nativization enabled
Fixed! UE-60794 Editor crashes when accepting target in Merge Tool
Fixed! UE-60774 Crash opening new level with current level and sublevel blueprints open
Fixed! UE-60759 Crash diffing two blueprint and reloading one of them
Fixed! UE-60661 Match3 fails to package with Nativization for Android, 'Function does not have a parameter named 'MoveType''
Fixed! UE-60873 Crash compiling an Anim Blueprint used in as a Sub Anim Instance twice after changing a variable to Text
Fixed! UE-60872 Crash compiling an Anim Blueprint used in as a Sub Anim Instance twice after changing a variable to String
Fixed! UE-60878 Changing parameter type will lose pin values (but not connections)
Fixed! UE-60711 Reloading blueprint with Diff window open will crash the editor
Fixed! UE-60705 Crash - Triggering a Blueprint Breakpoint Multiple times with the Blueprint Editor closed Crashes the Editor
Fixed! UE-60625 All pins are orphaned on a custom event call node when a pin is changed on the custom event
Fixed! UE-60624 Hang when hosting an online ShooterGame match
Fixed! UE-60584 Crash when doing PIE from Override Binding assets in QAGame
Fixed! UE-60047 SDL2 needs to be rebuilt for armhf (32bit)
Fixed! UE-59943 Linux crash on startup with Cook On The Fly
Fixed! UE-59928 Linux: suppressing -fPIE does not work as intended.
Fixed! UE-60217 User is not prompted to install the toolchain provided by UE4 when generating project files on Linux with an old clang version
Fixed! UE-60858 Unknown project file type 'CLion error when generating project files for CLion
Fixed! UE-60596 TestPAL crashes with MallocProfiler when trying to run on Linux
Fixed! UE-60566 Standard error is spammed with "Used memory before allocating anything was"
Fixed! UE-60398 4.20 modular binaries don't start on a number of Linux distros (Fedora, CentOS, Arch)
Fixed! UE-57836 Crash dragging MaterialImportTest.abc with materials into level
Fixed! UE-60146 Linux: EXR Image Sequences Render Black
Fixed! UE-60767 ARM server fails to build with: undefined reference to SDL_ConfineCursor
Fixed! UE-60242 Android Rendering issues on ARPG in Vulkan
Fixed! UE-59864 RemoteSessionApp has no UE splash (loads with black screen)
Fixed! UE-59576 Blending on meshes in Landscapes umap is not rendering properly in High End Mobile Preview or HTMl5
Fixed! UE-60781 Blackscreen in app on Galaxy S6 SM-G920F
Fixed! UE-60560 iOS: Errors During Build Step with dSYM File Included Due to Space In Project Path
Fixed! UE-58463 Thermals are Nominal message appears on DebugGame and Development iOS packages
Fixed! UE-57315 Match3 Sig 11 crash with GL RHIThread enabled
Fixed! UE-60277 Vulkan -sm5 application fails to load: Error: The global shader cache file SF_VULKAN_SM4.bin is missing
Fixed! UE-59572 Depth' blur needs to work on the new DOF
Fixed! UE-59535 Enabling Support Compute Skincache causes textures to render incorrectly on SK_Mannequin in game
Fixed! UE-59784 Static Mesh LODs are not changing their color based upon distance
Fixed! UE-59425 Movable Volumetric Fog causing black artifacts on Particle Lights
Fixed! UE-60901 DOF: take coc radius error into account when binning gathering sample
Fixed! UE-60854 Diaphragm DOF second coc dilate is not being used
Fixed! UE-60808 Material Collection Not Updated
Fixed! UE-60775 MetalRHI: "FMetalShaderPipeline does not have member named..." errors compiling Test config
Fixed! UE-59307 Add support for Compressed Volume textures in Vulkan
Fixed! UE-60612 Crash in FD3D11DynamicRHI::SetResourcesFromTables
Fixed! UE-57601 ShooterGame menu flashes in Vulkan on Linux
Fixed! UE-53183 Re-do optimization from 3689687
Fixed! UE-56009 Warning: Ambiguous search when launching TM-PhysicalLightUnits
Fixed! UE-60268 Min Roughness light parameter not functioning properly
Fixed! UE-60421 Extremely low frames on Context Examples - UMG with -vulkan
Fixed! UE-60944 PIE after an Undo of an Added Sub-scene causes a crash related to UMovieSceneTrack::GetMaxRowIndex()
Fixed! UE-60736 Using the Create Level Sequence Player node starts the sequence at a Random Start Time
Fixed! UE-60686 Tracks referencing the same sequencer don't work properly in package build
Fixed! UE-60841 Asset Size Mapper window text is clipped when High DPI is enabled
Fixed! UE-60730 Texture Editor viewport glitches when editing adjustment attributes
Fixed! UE-60699 Crash overwriting a recently-saved level
Fixed! UE-60926 Camera Safe frames offset when High DPI Support is enabled
Fixed! UE-60918 Vertices are offset from mesh when Large Verts is enabled with High DPI Support
Fixed! UE-60770 Unable to Reset to Default on various settings in the details panel of Texture Editor
Fixed! UE-60331 [CrashReport] UE4Editor_Landscape!ALandscapeProxy::FlushGrassComponents() [landscapegrass.cpp:1942]
Fixed! UE-48724 [CrashReport] UE4Editor_Landscape!ULandscapeInfo::UpdateLayerInfoMap() [landscape.cpp:1459]
Fixed! UE-48899 [CrashReport] UE4Editor_Landscape!ULandscapeInfo::RegisterActor() [landscape.cpp:1882]
Fixed! UE-51914 [CrashReport] UE4Editor_CoreUObject!FWeakObjectPtr::Get() [weakobjectptr.cpp:81]
Fixed! UE-60642 Modifying Curve Atlas Texture Size changes the curve index used by Material Instances
Fixed! UE-60332 [CrashReport] UE4Editor_MeshEditor!FMeshEditorMode::CreateWireframeMeshComponents() [mesheditormode.cpp:4780]
Fixed! UE-60261 EngineTest - MeshOrientation tests fail with: "Screenshot 'MeshOrientationTests_After Runup' test failed, Screnshots were different!"
Fixed! UE-60877 Renaming and deleting parameters from the system/emitter editor deletes and renames inputs in modules.
Fixed! UE-60874 Crash when editing float function inputs.
Fixed! UE-60847 Curve evaluation doesn't work with interpolated spawn until interp spawn is turned off and on again
Fixed! UE-60669 Renaming an Output Pin within an Niagara Script Details Panel breaks existing connections
Fixed! UE-60548 Crash when redoing after undoing the addition of an emitter to a system
Fixed! UE-53684 Niagara emitters without render modules will have a sprite module created for them when they're added to a system that can't be deleted
Fixed! UE-59114 Widget clips incorrectly when added at runtime
Fixed! UE-60731 Some widget elements render on top of the editor during PIE if they are wrapped by an invalidation box
Fixed! UE-60592 Ensure when force deleting a Widget Blueprint referenced by the level Blueprint
Fixed! UE-60342 Adding the Vehicle code feature pack to a project fails to compile with 'HMD_MODULE_INCLUDED' errors
Fixed! UE-60884 Installed builds fail when ARKit is enabled by default
Fixed! UE-60861 There are seams in the AR environment textures when applied to a skylight
Fixed! UE-60783 ARKit 2.0 Preview Support
Fixed! UE-60556 GearVR projects are not receiving Gear trackpad input
Fixed! UE-53905 Oculus CheckIfPointWithinPlayArea function returns incorrect results
Fixed! UE-51654 SteamVR plugin ignores windowed settings and forces app into fullscreen
Fixed! UE-54455 MR Calibration: When calibrating with Vive, alignment models don't show up
Fixed! UE-57633 ARKit: App Crashes when Swiped Off-Screen after Pressing "Start AR"
Fixed! UE-60756 LiveLink Client Panel not refreshing for sources not added through UI
Fixed! UE-60840 Crash dragging Spline Mesh Actor from modes panel into viewport
REMEMBER: Please report any new bugs you find by following the How To Report a Bug Guide
Comment