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4.21.1 Hotfix Released

The 4.21.1 Hotfix is now live!

Feel free to discuss this release on the 4.21.1 forum thread.

If you experience a bug with the 4.21.1 Hotfix, please follow the How to Report a Bug Guide to report it on the Bug Submission Form.
Fixed in 4.21.1
Fixed! UE-66389 [CrashReport] UE4Editor_CoreUObject!CastLogError() [casts.cpp:11]
Fixed! UE-66640 [CrashReport] UE4Editor_Engine!UWorld::IsGameWorld() [world.cpp:6185]
Fixed! UE-66639 [CrashReport] UE4Editor_Engine!FSkeletalMeshObjectGPUSkin::ReleaseResources() [skeletalrendergpuskin.cpp:180]
Fixed! UE-66509 Animation Modifiers that contain a null Animation Sequence value cause the Engine to crash when applied to an Animation Sequence
Fixed! UE-66661 [CrashReport] UE4Editor_Engine!FDerivedDataAnimationCompression::Build() [animcompressionderiveddata.cpp:95]
Fixed! UE-66634 [CrashReport] UE4Editor_UnrealEd!FBlueprintEditorUtils::FindBlueprintForGraphChecked() [blueprinteditorutils.cpp:2275]
Fixed! UE-66344 Building solution in shipping configurations builds invalid targets
Fixed! UE-66753 Editor running with “DebugGame Editor” configuration fails to launch (This happens only on 4.21 via Launcher)
Fixed! UE-66880 Bad code generation in VS2017 v15.7 and 15.8
Fixed! UE-66075 Disabling “Include Debug Files” for a Windows Distribution build does not exclude the debug files
Fixed! UE-66104 GitHub 5237 : Fix missing VS version indicator on .sln icon
Fixed! UE-66042 Remote compile Action RPG for iOS fails with rsync errors - unable to download Manifest.xml from the remote Mac
Fixed! UE-66047 Crash starting a timecode synchronization with Media players (AJA) - Assertion failed: Type != ERangeBoundTypes::Open
Fixed! UE-66051 Can’t synchronize Timecode provider with MediaBundle
Fixed! UE-66357 Attempting to start Shootergame with PixelStreaming enabled causes a crash, Assertion failed: IsValid() in SharedPointer.h - nVidia GPU
Fixed! UE-66367 [CrashReport] UE4Editor_BlueprintGraph!UK2Node::RewireOldPinsToNewPins() [k2node.cpp:928]
Fixed! UE-66638 [CrashReport] UE4Editor_Engine!AGameMode::InitGame() [gamemode.cpp:77]
Fixed! UE-66658 [CrashReport] UE4Editor_UnrealEd!FBlueprintEditorUtils::IsLevelScriptBlueprint() [blueprinteditorutils.cpp:3260]
Fixed! UE-66366 [CrashReport] UE4Editor_Core!FTextStringHelper::WriteToString() [text.cpp:1667]
Fixed! UE-66297 Blueprint Structure breaks when the Editor is closed and re-opened if the struct contains variables that are a Class Reference and a Soft Object Reference to a Blueprint
Fixed! UE-66767 K2Node_MakeContainer::PropagatePinType can cause crash
Fixed! UE-65365 Launching on IOS, sessions do not appear in the Session Frontend
Fixed! UE-66292 RecordPerformance Failing to Create Files Due to Missing CSVTools Directory
Fixed! UE-66316 GitHub 5262 : [BUGFIX] Fix for packaging when using custom VULKAN_SDK on GNUX.
Fixed! UE-41727 Linux crash reports are not showing up on crash report website if there is whitespace in the project’s path
Fixed! UE-66280 GitHub 5259 : [BUGFIX] First fix to make UnrealVersionSelector work correct on GNUX
Fixed! UE-64772 Warnings Occur During UHT Build Step when Packaging Code Projects
Fixed! UE-66426 dump_syms slows Linux iteration by several minutes
Fixed! UE-66745 UBT: Makefile generator adds “mono” instead of RunMono.sh on Linux
Fixed! UE-66801 Need command line to disable vulkan workaround in Linux
Fixed! UE-66302 GitHub 5260 : Ignore third party downloaded sdks
Fixed! UE-65229 ARM Server binary size has increased between 4.20 & 4.21
Fixed! UE-66922 GitHub 5306 : Fixing a file path bug
Fixed! UE-66103 Creating a code project on Mac will duplicate the project in the Xcode workspace
Fixed! UE-66050 Crash reported when launching the binary Editor on a 2018 iMac Pro
Fixed! UE-66093 Unable to determine home directory for remote user after updating MacOS to Mojave 10.14.1
Fixed! UE-66001 Device is unable to connect to desktop when using RemoteSession
Fixed! UE-65394 StrategyGame - Tapping on in-game UI buttons causes the buttons to disappear on iOS
Fixed! UE-66171 Assertion shortly after opening application on Lenovo S939
Fixed! UE-65399 Launch Images application crashes shortly after launch image is displayed with Assertion: Index>=0 && Index<NumBits BitArray.h on S939
Fixed! UE-65410 Launch images: Landscape crashes on device after loading on Kindle Fire 5th Gen
Fixed! UE-64067 Regression: Shader library size become too small when using -iterate option with little change in material.
Fixed! UE-61045 tvOS packaging fails due to: Error excluding PersistentDownloadDir from backup
Fixed! UE-65408 Minimum iOS version failure reports as invalid provision on IPP
Fixed! UE-66627 Full Screen Native Resolution not supported on new iPad Pro 11-inch and iPad Pro 12.9 inch (3rd generation)
Fixed! UE-66303 Correctly handle package name redirection and localization during material reload
Fixed! UE-66400 Various Vulkan issues
Fixed! UE-66172 Packages Samples Crash on Launch when Running -vulkan
Fixed! UE-66682 [CrashReport] libUE4Editor-VulkanRHI.so!void FVulkanCommonPipelineDescriptorState::SetUniformBuffer<false>(unsigned char, unsigned int, FVulkanRealUniformBuffer const*) [VulkanPipelineState.h:106]
Fixed! UE-66349 [CrashReport] UE4Editor_Renderer!FMaterialShaderMap::IsValidForRendering() [materialshared.h:882]
Fixed! UE-65820 Engine Test crashes during SK_VertexColors test in -Vulkan
Fixed! UE-66124 QA-Promotion animated lights not illuminating target mesh in vulkan
Fixed! UE-66636 Vulkan crash when running ShooterGame Highrise
Fixed! UE-66737 VulkanBackend doesn’t handle all infinite constant values
Fixed! UE-66678 [CrashReporter] libUE4Editor-VulkanRHI.so!VulkanRHI::VerifyVulkanResult(VkResult, char const*, char const*, unsigned int) [VulkanUtil.cpp:668]
Fixed! UE-62779 Skylight Intensity Doesn’t Behave The Same in OpenGL as with DirectX
Fixed! UE-66290 Progress Percent is removed from UMG Progress Bar when Transform Shear value is changed
Fixed! UE-66074 Minimum iOS Message from Enabling Metal Desktop-Forward Renderer is Inaccurate
Fixed! UE-66333 Crash on Level Load with Sequencer Event
Fixed! UE-66261 Sequence director fires events multiple times if multiple levels are streaming.
Fixed! UE-66897 Sequencer Batch Rendering cannot output multiple render passes in CLI
Fixed! UE-66307 Simulations become invalid after modifying their user parameters in system and emitter editors.
Fixed! UE-66971 CLONE - [CrashReport] UE4Editor_CoreUObject!StaticFindObject() [uobjectglobals.cpp:308]
Fixed! UE-66973 CLONE - Houdini plugin has compile errors
Fixed! UE-66843 Thai fails to shape correctly if the string starts with spaces
Fixed! UE-60696 [CrashReport] UE4Editor_SlateCore!FHittestGrid::FindFocusableWidget<<lambda_3a8b364273a2882da220e6e492096c17>,<lambda_d0075a811a928600995d1b2de6795365>,<lambda_105424556dbaeebf7f5bf9bed3e2f737> >() [hittestgrid.cpp:397]
Fixed! UE-65859 Simple UI Test fails due to screenshot differences in Vulkan
Fixed! UE-65527 Controllers disappear when entering Landscape in VR Mode
Fixed! UE-66353 Vulkan Crash on Startup
Fixed! UE-66522 Incorrect primitive culling with mobile multi-view
Fixed! UE-66329 GitHub 5265 : Removed duplicated WindowsMixedRealityHMD entry
Fixed! UE-65264 Windows Mixed Reality - Setting haptic to 1 and firing haptic causes editor crash
Fixed! UE-66362 [CrashReport] UE4Editor_Engine!HandleInvalidWorldContext() [unrealengine.cpp:12618]
Fixed! UE-65028 ARSharedWorld - “Receiving Preview Image/AR Data” are misleading messages for the client when they are waiting for the host to share their AR space
Fixed! UE-66955 Rebuild Light Maps UAT Commandlet contains null object warnings