Unreal Engine Issues
Unreal Engine Issues
UMovieSceneTrackInstance::GetWorld() does NOT work properly in Editor
UE - Anim - Sequencer - Mar 28, 2023UMovieSceneTrackInstance::GetWorld() returns nullptr on Editor, so user can't use any function using WorldContext and Subsystem. The following code change may fix this issue UWorld* UMovieSceneTra ...
Parameters show up in material instances even if they're not supposed to be exposed
UE - Rendering Architecture - Materials - Feb 28, 2018In this case, I've added inputs to a material function. That material function input uses a parameter as it's default value. [image: Inline image 1] When referenced in the shader[image: Inline ima ...
Cloth painting - Camera movements are broken once leaving the painting tool.
UE - Simulation - Physics - Character - Aug 29, 2023Possibly a regression, but I could reproduce this issue as far as 5.2, so unsure when it started. The issue seems to be that the cloth painting tool lock the camera movements during painting, but d ...
Invalidation panels can retain stale hittest data when caching is disabled/enabled
UE - Editor - UI Systems - Slate - Aug 20, 2024Changes to the hit test grid of an invalidation panel while caching is disabled won't be respected when caching is reenabled. This can cause interactive widgets such as buttons who were set to colla ...
Dataprep crash
UE - Editor - Content Pipeline - Visual Dataprep - Apr 16, 2025This question was created in reference to: [Link Removed] Last post fixed the import crash, but it seems it added another. If we hit Execute button twice in a row by mistake we get a crash with th ...
The number of elements in an array remain the same as the default when duplicating an actor
UE - Gameplay - Blueprint - Feb 22, 2017If a user removes elements from an array in an instance of that blueprint in the level and then duplicates the actor (in the level ) containing the array, then the resulting actor will have the orig ...
Ensure condition failed when destroying a Level Sequence Actor on tick
UE - Anim - Sequencer - Oct 18, 2019In Tick processing of LevelSequencActors of World Tick, If you destroy an actor with an actor's ticks, delete it immediately from the LevelSequencActor array. I think that the problem occurred becau ...
Moving the file location of the Editor Startup map appears to break the reference to the startup map
Tools - Nov 10, 2016Moving the file location of the Editor Startup map appears to break the reference to the startup map. The editor fails to find the map and so does not use it for the start up map. Notes: In the ...
Using collapse to function on an event binding causes a crash when that function is referenced in another class
UE - Gameplay - Blueprint - Nov 28, 2016Collapsing an event binding to a function results in a function that takes in a delegate as an input. This function existing ends up causing any references to this blueprint class in another class t ...
Changing blendspace on a blendspace player node resets the play time
OLD - Anim - Jan 11, 2017Open QAGame and duplicate Player_RunBlend to Player_RunBlend2. Create an animation blueprint for M_Avg_Base_AnimSkeleton and set it up in the screen shot below. ( "New Var 0" and "New Var 1" contai ...