Unreal Engine Issues
Unreal Engine Issues
Performance hitch from RemoveGeometryCache flushing the render thread
UE - Editor - Content Pipeline - Alembic - Jun 12, 2025FGeometryCacheStreamingManager::RemoveGeometryCache calls FlushRenderingCommands which shows up as a hitch when profiling. [Link Removed] Ideally the flush added in CL#23782411 to fix a rare deadl ...
Crash Occurs on Exiting Standalone After Using DemoPlay
UE - Networking - Mar 2, 2017Using Execute Console Command nodes to record and play back a demo is causing a crash in standalone. Using the console commands themselves does not seem to cause the same crash to occur. ...
FFieldPath resolution doesn't handle redirection
UE - CoreTech - Feb 16, 2022A licensee has found that redirectors don't apply to FFieldPath. We should integrate it with the following changes:It needs better error handling (looks like it could infinitely recurse),The change ...
Crash when changing the World Grid Material to Unlit
UE - Graphics Features - Mar 13, 2017A crash occurs when setting the WorldGridMaterial from the Engine Content to the Unlit Shading Model and pressing apply. ...
4.6 Delegate error in Blueprints
UE - Gameplay - Blueprint - Dec 12, 2014When looking into the bd_hud_scoring and bd_rules_maze blueprints in the users project (Provided below), there are nodes that are throwing errors. If you press compile, the errors go away and the co ...
HLOD build crashes when GroupActor is present
UE - World Creation - Worldbuilding Tools - HLOD - May 24, 2022The licensee shared information that a Null check on the following Actor can be used as a workaround. static TArray<UActorComponent*> GatherHLODRelevantComponents(const TArray<AActor*>& InSourceAct ...
Editor crash opening level with instance blueprint component
UE - Gameplay - Blueprint - Feb 20, 2017When an actor has an instanced blueprint property, the order in which the map's imports are being verified when loading can cause the editor to crash. For example, trying to load an instanced bluep ...
Level sequence updates more than once per frame when content editors are open
UE - Anim - Sequencer - May 27, 2016When content editors are open, they cause sequencer to be updated more than once per frame. This causes animations running in PIE to play faster than expected. Licensee provides code for a potential ...
Blueprint Implementable Events and Event dispatchers with the same name break the event dispatcher.
UE - Gameplay - Blueprint - Sep 22, 2015Creating an event dispatcher and BlueprintImplementableEvent function with the same names causes a signature conflict inside the blueprint. The event dispatcher is then broken as it cannot be delet ...
REGRESSION: HierarchicalInstancedStaticMeshComponent LOD transitions are broken in 4.9 and Main
UE - Graphics Features - Aug 24, 2015While testing another fix I noticed HISM LOD transitions are not working in Main or 4.9 branch. There is no screen-door effect and multiple LODs seem to be rendering simultaneously compared to 4.8. ...