Unreal Engine Issues
Unreal Engine Issues
In -game in Editor, if streaming-in a LevelInstance and initialize its world partition, then leaving that cell and make it go outside the streaming grid, to re-enter it again, will trigger a check(!StreamingPolicy) if no GC has happened during that time.
UE - World Creation - Worldbuilding Tools - World Partition - Jan 27, 2025This crash can be fixed by adding a couple of || IsRunningGame() like it is done here: FGenerateStreamingContext Context = FGenerateStreamingContext() .SetLevelPackagesToGenerate((bIsPIE ...
Replacing blueprint assets causes editor to crash
UE - Gameplay - Blueprint - Jun 1, 2015When attempting to replace references of one blueprint with another a number of error message windows pop up ([Link Removed]) and the editor will crash. This is a regression since it was working in ...
Editor crash when Use Dynamic Material Instance is set to "True" on landscape
UE - LD & Modeling - Terrain - Landscape - Mar 23, 2018Setting "Use Dynamic Material Instance" to true in the landscape details will cause the editor to crash. Reproduced in 4.19.0 CL 3944462 and 4.20 Main. This feature is not available in 4.18.3. ...
After adding MovieSceneObjectPropertyTrack from BP or Python, clicking the pull down of the added track occurs crash
UE - Anim - Sequencer - Sep 6, 2019When MovieSceneObjectPropertyTrack is added from BP or Python, PropertyClass of UMovieSceneObjectPropertyTrack becomes null, so it crashes with the following processing of SPropertyMenuAssetPicker : ...
Painted Instanced Foliage Actors Rendering Multiple LOD's Simultaneously
UE - World Creation - Worldbuilding Tools - Foliage - Sep 1, 2015When using a mesh as an Instanced Foliage Actor the Levels of Detail are always rendered. The user reporting this issue mentions he needs to use extreme different LOD value ranges for screen size wi ...
Enabling Preview Rendering Level Mobile GLES3.1 on Map With Vector Fields Results in Editor Crash
UE - Platform - Mobile - May 21, 2018Reproduced Crash on 4.18.3, 4.19.2, and Main CL 4081612. Licensee states: Based on a quick inspection of the code, it seems FVectorFieldVisualizationVertexFactory::ShouldCache() returns false (req ...
Legacy HLOD Nanite Meshes Always Rendering in 5.5
UE - World Creation - Worldbuilding Tools - HLOD - Mar 17, 2025From licensee: We are using the legacy HLOD system in our game. With 5.5 there was a change to FSceneProxyBase::DrawStaticElementsInternal() where the implementation was removed (https://github.com ...
Changing a Media Player asset from Stream Mode: FromURL to From Memory crashes the editor
Tools - Dec 30, 2014Changing a Media Player asset from Stream Mode: FromURL to From Memory crashes the editor. In 4.8, the editor crashes immediately upon changing that value, with no crash report. In 4.6 and 4.7 Pre ...
Cloth paint update issues
UE - Simulation - Physics - Jan 7, 2020Activating and Deactivating Cloth Paint marks the skeletal mesh as dirty, even if no values were painted and there is no transaction in the Undo History. Painting Max Distance values from non-zero ...
[CrashReport] UE4Editor_WorldBrowser!FMulticastDelegateBase<FWeakObjectPtr>::RemoveAll() [multicastdelegatebase.h:81]
UE - World Creation - Worldbuilding Tools - World Composition - Nov 2, 2017This is a trending crash coming out of 4.18 and may be a regression. Users have not provided any descriptions of their actions when the crash occurred. Source Context 72 /** 73 ...