Unreal Engine Issues
Unreal Engine Issues
Hot reload does not update Enum entries
UE - Gameplay - Blueprint - Oct 13, 2015Performing a hot reload after updating an Enum will not reflect the update until the editor is closed/reopened. UPDATE (8/23/17): Restarting the editor dose not immediately update the enum. When ...
Crash when using Mesh Reduction on ScotsPine_01 for LOD3
UE - Graphics Features - Jan 30, 2017A crash occurs when trying to use the Mesh Reduction tool for the ScotsPine_01 static mesh from the Open World Demo collection. The assets from this project are usually very processor heavy due to ...
Mover character no longer calls ProduceInput on server when the only client unpossesses it and disconnects
UE - Runtime - Character - Oct 21, 2025When a client disconnects/unpossesses a mover character, the character's Network Prediction Component will re-configure itself now that it does not have a net connection. However, this handling will ...
Potential Memory Leak when frequently terminating and re-initializing FConstraintInstance
UE - Runtime - Simulation - Mar 29, 2022From User: When frequently terminating and re-initializing the FConstraintInstance, there appears to be a leak when cleaning up the disabled joint, which leads to an ever growing list that gets sort ...
NDC Sorting Incorrect
UE - Rendering - Architecture - Niagara - Mar 12, 2026Using the new NDC BP nodes in 5.7 causes sorting to break; one system, regardless of world placement, is always drawn over the other. Even when the viewpoint puts the dominant system in the foregrou ...
VSM r.Shadow.Virtual.UseReceiverMaskDirectional Breaks Cache Behavior Overrides
UE - Rendering - Features - Shadows - May 19, 2026Since 5.7 this CVAR has been turned on by default and it ibreaks / prevents shadow cache behaviour to be set as we used to in 5.6 on meshes when r.Shadow.Virtual.UseReceiverMaskDirectional 1 Most o ...
Distance Cull Fade Node on Material does not work with Skeletal Mesh
UE - Rendering - Architecture - Materials - Apr 22, 2022The licensee reports that this issue is caused by the following code not performing a Buffer update. .\Engine\Source\Runtime\Renderer\Private\ShaderBaseClasses.cpp void FMeshMaterialShaderElementD ...
Runtime virtual texture sometimes shows corrupted tiles
UE - Rendering - Architecture - Apr 28, 2025Some licensees have reported seeing intermittent corruption of runtime virtual texture tiles. This hasn't been reproduced at Epic. Usually this shows up as some small percentage of rendered tiles l ...
Numerous LogMetal: Warning: AsyncCopyFromBufferToBuffer on overlapping ranges Warnings
UE - Graphics Features - Mar 13, 2018Numerous LogMetal: Warning: AsyncCopyFromBufferToBuffer on overlapping ranges Warnings Warnings do not appear to be linked to any visual/performance problems in the editor. Could be safely ignored. ...
Inherited Blueprint component template data is not being validated on save.
UE - Framework - Blueprint - Sep 8, 2022UBlueprint::IsDataValid() does not currently check component templates inherited from a parent Blueprint class asset's SimpleConstructionScript; only the current class hierarchy is considered. Given ...