Unreal Engine Issues
Unreal Engine Issues
Static lights become stationary after toggling visiblity of level in packaged build
UE - Rendering - Features - Jun 11, 2025In 5.5, there is a regression with baked lighting where static lights become stationary lights when a level is hidden and then made visible again. This happens in packaged builds and shows up as sta ...
Local Variable loses value after reference moves file location
UE - Gameplay - Blueprint - May 23, 2017Local Variable loses value after reference moves file locations. This does not just affect construction scripts, following these steps with a function instead produced the same result. This issue do ...
FHLSLMaterialTranslator::GetMaterialEnvironment can crash or not load UMaterialParameterCollections
UE - Rendering - Architecture - Materials - Apr 30, 2025In UE 5.5, the Editor may crash in FHLSLMaterialTranslator::GetMaterialEnvironment when loading materials with Material Parameter Collections, likely due to async loading. Calling ParameterCollectio ...
Twinmotion sign-in error when attempting sign-in inside app
TM - Core - May 18, 2026Reported in SF [Link Removed] Attempting to sign into Twinmotion from within the TM 2026.1 editor results in a consistent sign-in error using the sign-in buttons. Initial sign-in during launch whe ...
InstanceOnly UProperties accessible in Blueprint
UE - Framework - Blueprint Editor - Nov 30, 2022Reproduced 3/3 times. Issue does not occur in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed Regression. ...
Crash when deleting BindingOverrides if the target property is left open on the details panel
zComponent - Archive - Sep 22, 2023Crash if opening ALevelSequenceActor::BindingOverrides in the details panel and run a process that empties the BindingOverrides elements. Workaround: FMovieSceneObjectBindingID FMovieSceneObjectBi ...
Speedtree shader node broken in a Shipping package.
UE - Graphics Features - Jul 6, 2018I attached the 4.19 and 4.20 version of the project. The trees have no leaves when packaging with Shipping in 4.20 preview 5. It works fine in 4.19. ...
[Reverb Effect] - Deactivate Reverb Effect Blueprint Doesn't Deactivate Reverb
UE - Audio - Aug 11, 2021When deactivating a reverb, it's removed from the Activated List, but doesn't get removed from being the active reverb. Confirmed occurs in 4.27 and 5.0 ...
BlackmagicMediaSource causes a memory leak if "Just-In-Time Rendering" option is ON.
zComponent - Archive - Oct 31, 2023Since 5.3, BlackmagicMediaSource causes a memory leak. This didn't happen on 5.2. You can see the leak on PIE. [Image Removed] [Image Removed] If "Just-In-Time Rendering" option in the MediaB ...
[Audio Modulation] - Ensure is thrown when attempting to modulate a Source Effect at runtime
UE - Audio - Modulation - Sep 6, 2023Does *not* occur in editor. Only in standalone and runtime. Occurs when modulating Chorus or Bit Depth Also occurs in 5.2 and 5.3. I also noticed the test with this is supposed to set the chorus e ...