Unreal Engine Issues
Unreal Engine Issues
[UE 5.8][MediaViewer] Crash when switching Level Editor viewport type to Cinematic Viewport
UE - CAPT - Tools - Media Viewer - Oct 19, 2026POST LINK: https://forums.unrealengine.com/t/ue-5-8-mediaviewer-crash-when-switching-level-editor-viewport-type-to-cinematic-viewport/2747407 POST BODY:Summary The editor crashes when Media Viewer ...
[SSAM]Textures that are still compiling are all counted as UnknownRef
UE - Engine Scaling - Streaming - Oct 5, 2026In UE5.8, the texture scale fallback is no longer applied when SSAM is enabled. As a result, if a material cannot access its TextureStreamingData when it is loaded, its textures are treated as Unkno ...
Particle Random Value is the same for all particles with a Niagara Mesh Renderer
UE - Rendering - Architecture - Niagara - Sep 28, 2026A material using the Particle Random Value node returns the same value for every particle drawn by a Niagara Mesh Renderer. Particle transforms are not affected, only the random value. This happens ...
Light Function and Post Process domain material thumbnails show the default material
UE - Rendering - Architecture - Materials - Sep 25, 2026Since 5.8, materials whose Material Domain is Light Function or Post Process no longer preview correctly in the editor. They render as the default material (WorldGridMaterial) instead of the materia ...
ResolvedView.DirectionalLightColor and DirectionalLightDirection go black when one of several directional lights is removed from the scene
UE - Rendering - Features - Sep 25, 2026With more than one directional light in the scene, ResolvedView.DirectionalLightColor and ResolvedView.DirectionalLightDirection can report the wrong light, or black and a zero vector, while a direc ...
Motion blur artifacting in MetaHuman Crowd demo
UE - Rendering - Features - Sep 10, 2026This issue was reported by a licensee and we also hit it during dev work on the crowds demo. It seems that this may be a general issue with motion vectors and teleporting actors as there are variou ...
Crash when opening a texture or editing its properties after stopping a preview in the material editor
UE - Rendering - Architecture - Materials - Sep 5, 2025When a texture asset has certain properties edited, its PostEditChangeProperty() method calls to UTexture::NotifyMaterials(), which triggers a recompilation of materials that reference it in their m ...
[CrashReport][GPU Crash] NodeAndClusterCull
UE - Rendering - Features - Nanite - Nov 19, 2024Users affected: 51 Total occurrences: 90 Last occurrence: November 19th 2024, 3:25:41 am First occurrence: August 7th 2024, 8:10:10 pm Latest version: ++UE5+Release-5.5-CL-37670630 Platform: Win64 [ ...
Crash after 'Reparent Blueprint' when renaming component on-top of orphaned inherited component
UE - Framework - Blueprint Editor - May 7, 2024After reparenting a blueprint and inherited components from the previous parent are removed, trying to give a new component the same name as a previous component causes a crash inside UObject::Renam ...