Unreal Engine Issues
Unreal Engine Issues
Memory leak in FMaterialPSORequestManager
UE - Rendering - Architecture - RHI - Jan 21, 2026Context: FMaterialPSORequestManager::PrecachePSOs() is called at runtime when an asset utilizing a material is loaded. This occurs during engine init, travel, and when any async or synchronous load ...
Linux: UE_ENGINE_DIRECTORY not being set by UBT
UE - Platform - Linux - Mar 27, 2018UBT is not passing UE_ENGINE_DIRECTORY to GForeignEngineDir because in UEBuildTarget.cs IsCurrentPlatform only checks for Windows and Mac. Because GForeignEngineDir is not set, config files and oth ...
Linux: Assertion at splash screen when trying to open UE4Editor
UE - Platform - Linux - Mar 21, 2017I ran into this while looking to verify [Link Removed] at CL 3355923. I logged the issue I was verifying the fix for last night and have not updated anything locally, so the "OpenGL 4.3 not supporte ...
In Sequencer, copying a Missing/Invalid Bound Object to a track may crash the Editor with an Unhandled Exception at UExporter::FindExporter()
zComponent - Archive - Jun 26, 2025In Sequencer, copying a Missing/Invalid Bound Object to a track may crash the Editor with an Unhandled Exception at UExporter::FindExporter(). The licensee has provided a txt file that contains the ...
Reimporting Duplicated Mesh from Blender Creates Merged Meshes
Tools - Mar 26, 2018When a mesh in Blender is Duplicated and exported as an FBX, then imported into Unreal with Combine Meshes unchecked, then both meshes reimported, one of the meshes has another mesh added to it. The ...
Show Collections shows up twice when box is checked and multiple content browsers
UE - Editor - Content Pipeline - Content Browser - Jun 29, 2015When you have 'show collections' checked off and you open up an additional content browser, 'show collections' shows up twice in the menu. ...
Print String duration divided by number of players
UE - Gameplay - Blueprint - Jul 9, 2018Print string duration is divided by number of PIE players. ...
Second controller input doesn't work setting client mode on PIE.
UE - Gameplay - Input - Feb 3, 2021When two controllers connected, player2 input is disabled in client mode in PIE. It worked correctly in 4.25, but it has been wrong since 4.26. Digging into FSlateApplication::ProcessKeyDownEve ...
Crash when reopening a project that has a Child Actor component in a BP with a WaterBody class set as the Parent Class
UE - Graphics Features - Apr 29, 2021When adding a child actor component to a Blueprint with the Parent Class set to one of the new Water classes and then placing it in the world, the project will crash on open. This was tested with th ...
SetMasterPoseComponent overrides any SetMorphTarget operations
OLD - Anim - Oct 16, 2015Using Set Master Pose Component overrides any Set Morph Target operations on the slave component. ...