Unreal Engine Issues
Unreal Engine Issues
Mass entities initializing fragments on the incorrect archetypes due to shared CreationContext
UE - Engine Scaling - Mass - Feb 3, 2026UMassAgentSubsystem::HandlePendingInitialization creates a single FEntityCreationContext that is reused across all iterations of the PendingAgentEntities loop. When SpawnEntities eventually calls in ...
Adding new elements to an array in code does not update in a class based blueprint on compile
UE - Gameplay - Blueprint - May 5, 2015When adding elements to an array inside a code class, blueprint instances of the class do not have their array updated after a hot reload. ...
Collision outcome is different between PIE and Mobile Preview/Packaged Project.
UE - Simulation - Physics - Mar 25, 2015When playing the user's project in editor vs Packaged, there has been different results for the enemies collision. When playing in PIE, you are able to fly through the enemies with no issues. When p ...
Maya Generated FBX Files Fail to Import Properly into UE 4.10
Tools - Nov 24, 2015The same animation FBX file generated from Maya will import correctly into UE4.9 but incorrectly into UE4.10. Moreover, if you generate an FBX from the animation that was successfully imported from ...
Problem with material layers using interpolator nodes
UE - Rendering - Architecture - Materials - Jun 7, 2024The Vertex Interpolator Material Expression appears to collapse separate instances from separate Material Layers, leading to visual artifacts when used. Also tested on UE5_Main, CL: 34200103 ...
Invalid DumpGPU capture when ProjectDisplayedTitle contains special utf8 chars
UE - Rendering - Features - Mar 7, 2025Placing a special UTF-8 character into the "ProjectDisplayedTitle" will result in GPU dumps failing to open. This appears to be because the dump will switch between us-ascii and UTF-16 file formats ...
AutoSize triggers ensure on shortened Skel Anim Section moved past anim length
zComponent - Archive - May 26, 2026In Sequencer, calling "Edit > Auto Size" on a UMovieSceneSkeletalAnimationSection triggers the LowerBound > UpperBound ensure in UMovieSceneSection::SetRange (MovieSceneSection.h:333) when the secti ...
Backout attempted fix for - AutoSize triggers ensure on shortened Skel Anim Section moved past anim length
zComponent - Archive - May 29, 2026In Sequencer, calling "Edit > Auto Size" on a UMovieSceneSkeletalAnimationSection triggers the LowerBound > UpperBound ensure in UMovieSceneSection::SetRange (MovieSceneSection.h:333) when the secti ...
[CrashReport] UE4Editor_SlateCore!FHittestGrid::GetBubblePath() [hittestgrid.cpp:145]
UE - Editor - UI Systems - Slate - Oct 27, 2017This is a trending crash coming out of the 4.18 release. Users have not provided any descriptions of their actions when the crash occurred. Based on the affected project names, this crash seems co ...