Unreal Engine Issues
Unreal Engine Issues
NavModifierVolume's FailsafeExtent is applied to the wrong area
UE - AI - Apr 16, 2020The FailsafeArea of NavModifierVolume is generated at a different location from the center of the actor when it rotated. This means that the effect of rotation is incorrect. (see attached file) W ...
BuiltData is saved alongside it's map, even if lighting hasn't changed
Tools - Jun 25, 2021Saving a map will always resave the map's BuiltData, even if the BuiltData hasn't been marked dirty. Changes were made to avoid marking it dirty for [Link Removed], but the call to SaveWorld in FEdi ...
Behavior of reparenting Component on UE5 is different from UE4
UE - Gameplay - Blueprint Editor - Mar 29, 2022In UE4, Reparenting the Child Component did not update it on the screen, but the Relative Transform was updated. However, UE5 now retains Relative Transform, so there are on-screen updates. This is ...
Virtual Heightfield Mesh crash using released Vertex Factory
UE - Rendering - Architecture - Jul 25, 2023When using VirtualHeightfieldMesh we see intermittent crashes in FDepthPassMeshProcessor::TryAddMeshBatch(). This can happen when FVirtualTextureProducerCollection::CallPendingCallbacks() is called ...
bIgnoreAllPressedKeysUntilReleaseOnRebuild in Enhanced Input behaves unexpectedly during pawn possession
UE - Gameplay - Input - Jun 11, 2025This is a speculative bug report from the user. The fix for this is to re-do the work of 31224705 but in a better way. The "bShouldBeIgnored" flag is being overriden by the previous mapping's va ...
Clustered Deferred Shading relies on r.Nanite.ProjectEnabled Cvar
UE - Rendering - Graphics Features - Shadows - Feb 25, 2026When Nanite is disabled at the project level with r.Nanite.ProjectEnabled=0, clustered deferred shading stops working. This happens because the FDeferredShadingSceneRenderer::RenderLights method doe ...
Setting the brush type of a custom volume BP causes the editor to crash
Tools - Nov 17, 2014Setting the brush shape of the root component for a custom volume BP causes the editor to immediately crash. ...
Crash in Retarget Manager with Humanoid Rig when trying to re-assign a bone to a node
OLD - Anim - May 26, 2015Crash in the Retarget Manager with Humanoid Rig when trying to re-assign a bone to a node. Happens particularly when there is already a bone selected and you want to select a new one. [Link Remove ...
Mac Crashing on Editor Launch
UE - Graphics Features - Sep 24, 2015User reporting he is crashing when launching the Editor "This is a 4.9.1 binary build (latest), I can't give you the exact version because it crashes on the initialisation stage at 0%. The system i ...
Crashes in movie player on Android
UE - Platform - Mobile - Apr 23, 2015There are a number of reported movie crash issues, but this report likely covers the main cause. Garbage collection changed in Android 4.0 and we are triggering a check that does not happen with ba ...