Unreal Engine Issues
Unreal Engine Issues
[CrashReport] Crash CheckForWorldGCLeaks() - EditorDestroyWorld()
UE - AI - Sep 8, 2017This is a somewhat common but longstanding Mac crash that has affected users since at least 4.13. Recently in 4.17.1, the crashes are all occurring in various ARKit projects User DescriptionsI add ...
HTML5 fails to compile on Mac/Windows - Shipping
UE - Platform - Apple - Jan 13, 2017HTML5 fails to compile on Mac when built for shipping in binary I did not see this when packaging for development yesterday Does not occur in 4.14.3 The error appears to be WebGL relatedError: Web ...
[CrashReport] Mac crash - UE4Editor-Slate.dylib!PrepassWindowAndChildren(TSharedRef<SWindow, (ESPMode)0>)
UE - Platform - Apple - Oct 27, 2017This Mac crash originally occurred in 4.15 around March 2017, then decreased in frequency during 4.16 and 4.17. It may be starting to trend again in 4.18. There is one record of this occurring in 4 ...
Crash when CharacterMovementComponent's CapsuleTouched processes overlap with a GeometryCollectionComponent
UE - Runtime - Character - Oct 23, 2026POST LINK: https://forums.unrealengine.com/t/crash-when-charactermovementcomponents-capsuletouched-processes-overlap-with-a-geometrycollectioncomponent/2763431 POST BODY:Summary When a Character's ...
Shader Compiler Crashes in Remote Build
UE - Graphics Features - Nov 11, 2019Output log when crashing UATHelper: Packaging (iOS): LogCook: Display: Max memory allowance for cook 16384mb min free memory 0mb UATHelper: Packaging (iOS): LogCook: Display: Mobile HDR setting 1 ...
Garbage Collection Causing Noticeable Hitches
UE - Foundation - Core - Apr 11, 2016Garbage Collection is causing noticeable hitches on whatever interval it is run on. This is noticeable in the UE4 Profiler, as you will see a spike every X amount of seconds, depending on how often ...
Regression: FAnimInstanceProxy memory leak when BeginDestroy() called on UAnimInstance before USkeletalMeshComponent
UE - Runtime - Animation - Feb 10, 2025In UE 5.5, the fix applied by CL 36529858 in ue5-main updated USkeletalMeshComponent::ClearAnimScriptInstance() to call AnimScriptInstance::UninitializeAnimation() on the animation instance. This, i ...
Adding Angular Impulse on Begin Play causes a Crash
UE - Simulation - Physics - Jun 29, 2016Calling Add Angular Impulse on BeginPlay causes the editor to crash. Workaround: Adding a short (.01s) delay after BeginPlay prevents the crash. Regression: No, crash occurs in 4.11.2 as well. ...
In the level editor, when configuring a component that is part of an actor blueprint, adding entries to a TMap with C++ enum keys results in duplicate keys and an incorrect warning popup.
UE - Editor - Jan 22, 2026Note: This started happening in UE 5.4 and persists up to latest. It is probably related to [Link Removed] Closed ([Link Re ...
Packaged Win32 Shootergame crashes in OpenGL
UE - Graphics Features - Nov 4, 2014Packaged Win32 Shootergame crashes in OpenGL. This cropped up while testing on Windows XP, but occurs on all platforms if you launch in OpenGL. QA REGRESSION: YES WORKING: Regressing now BROKEN: ...