Unreal Engine Issues
Unreal Engine Issues
Linux Crash Reporter can fail due to exceeding crash malloc space when generating the report
UE - Platform - Linux - Sep 16, 2026On Linux a crashing process can fail to produce a crash report at all. The crash folder is created and contains CrashContext.runtime-xml and Diagnostics.txt, but the copied log file is 0 bytes, Cras ...
World Partition - HLOD: baked HLOD textures contain unresolved runtime virtual texture content
UE - Engine Scaling - Streaming - Sep 15, 2026Baking HLODs for actors that sample Runtime Virtual Textures produces incorrect baked textures: blurry or unresolved RVT tiles, fully black tiles on the first bake of an editor session, and washed-o ...
SceneCaptureComponent2D destroys shared Lumen Radiosity atlases every frame, breaking temporal accumulation in the main view
UE - Rendering - Features - Lumen - Sep 14, 2026A USceneCaptureComponent2D with bCaptureEveryFrame = true and default post process settings causes FLumenSceneData::IndirectLightingAtlas and RadiosityNumFramesAccumulatedAtlas on the sharedScene->D ...
Scrubbing the timeline in Sequencer can hang the editor when operating on constrained actors with complex control rigs
UE - ACT Character - Anim in Engine - Sep 11, 2026The issue is caused by UAnimDetailsProxyManager::ForceUpdateProxyValue triggering evaluation of constraints that are attached to control rigs. When scrubbing, requests to ForceUpdateProxyValue are ...
Level Sequence spending long time validating assets
UE - ACT Character - Control Rig - Aug 31, 2026Hi After migrating our animation project from 5.7 -> 5.8 we notice that some level seqeunces take much longer to save (during validation stage). This issue only exhibits when using control rigs in ...
Sequencer Crash (GC Leak) in Editor
UE - ACT Character - Sequencer - Aug 31, 2026A GC leak, similar to the one fixed by 44483919 but for Level Sequences in Level Instances rather than ones with Widgets. A Level Sequence Actor in a Level Instance points to a Level Sequence Asset ...
Mesh Reshape node with modified geometry from another skeleton explodes mesh.
UE - Runtime - Mutable - Mar 31, 2026Using the mesh reshape node with seperate meshes produces a broken mesh. An example project: Most if not all clothes will be originally made to fit the Average Male body. I'm trying to morph a tu ...
Inherited component properties on actor instances of derived blueprints are silently reset to defaults when the blueprint enters a compile error state and is subsequently fixed
UE - Framework - Blueprint Compiler - Mar 6, 2026When an instance of a child blueprint in a level enters the “Bad Blueprint” state due to a compile error it will reset to default values when it is restored after the compile error has been fixed. ...