Unreal Engine Issues
Unreal Engine Issues
ParticlePosition doesn't use Previous values
UE - Niagara - Jan 9, 2024FHLSLMaterialTranslator::ParticlePosition does not return Previous information when request which can result in bad motion vector calculation. ...
[Interchange]: Skeletal mesh import do not take geometric transform
UE - Editor - Content Pipeline - Import and Export - Oct 9, 2024We need to support geometric transform for meshes when importing skeletalmesh ...
Crash when displaying lumencards on map with many objects
UE - Rendering - Graphics Features - Lumen - Aug 1, 2025There is a thread conflict between FRDGBuilder execution in Background Worker and LumenVisualizer's LumenCard add/delete process. When lumen cards are displayed in a scene with many objects, a crash ...
InvariantLeft and InvariantRight justification mispositions wrapped multi-line text
UE - AI Workflows - UI Systems - Feb 26, 2026When a UMG Text widget is set to Auto Wrap and uses InvariantLeft or InvariantRight, the wrapped visual lines are positioned differently than expected compared to Left/Right. In the current engine ...
Camera actor preview window does not display properly in orthographic view
Tools - Apr 13, 2015Adding a camera to the scene and setting the projection mode to orthographic doesn't display properly in the preview window. ...
Compiling blueprint with anim bp crashes editor in MathExpr exec
UE - Gameplay - Blueprint - Jan 30, 2016Compiling a player character blueprint that is tied to an anim bp crashes the editor. Frequency: 2/2 Crashreporter: N/A ...
LIVE: The editor crashes on Mac when attempting to open the attached Media Player .uasset
Tools - Nov 4, 2014Does not occur on PC. CRASHREPORT: [Link Removed] CALLSTACK: <unknown module>! FOutputDeviceMacError::HandleError() <unknown module>! EngineCrashHandler(FGenericCrashContext const&) <unknow ...
Converting Texture Sample to Parameter when MipValue set to "Level" or "Bias"
UE - Rendering - Architecture - Materials - May 27, 2015When a Texture Sample's MipValue is set to something other than "none" (which adds the extra pin), attempting to convert that Texture Sample to a parameter will cause the Editor to crash. (Simple r ...
Mouse cursor appears outside of viewport while in PIE if UE4 and UDK are both open
Tools - Jan 15, 2015Mouse appears outside of viewport window when cursor is dragged off of editor window while UDK is open. This occurs even if UDk is minimized. Note: Cursor will appear outside of editor window but a ...
A bug in UBTService_BlueprintBase makes it impossible to create "deactivation-only" BP implemented BT services
UE - AI - Jan 22, 2016A bug in UBTService_BlueprintBase makes it impossible to create "deactivation-only" BP implemented BT services. ...