Unreal Engine Issues
Unreal Engine Issues
Importing static mesh while a PIE session is running permanently breaks nanite on the asset
UE - Editor - Content Pipeline - Import and Export - Mar 12, 2025Importing a Static Mesh during PIE can cause it to never enable Nanite, even if it reports that Nanite is enabled. To re-enable Nanite on the mesh, the asset needs to be deleted and imported again ...
When using a NavModifier with a NavBoundsVolume being in a SubLevel, unloading the level causes a crash.
UE - AI - Jul 19, 2018When repeatedly loading and unloading sublevels with a NavBoundsVolume, it will cause a crash when using a NavModifierVolume. When the NavMesh is unloaded, it seems that the number of the DirtyLayer ...
TMap<Bool is disallowed despite bool having a hash
UE - Gameplay - Blueprint - Nov 22, 2022Reproduced 3/3 times. User is unable to create a new TMap with bool key through Blueprints (which is the expected result). Issue is technically a Regression, as the ensure does not occur in //UE5/ ...
Editor Crashes When Reopened Project's Level that Contains Vertex Painted Asset is Opened
Tools - Apr 17, 2018Editor crashes when asset is imported in as a skeletal mesh, brought into a level, vertex painted using the paint tab under modes, all assets are saved, project is reopened, then level is reopened. ...
4.7 Regression: Character::OnJumped_Implementation() not virtual and will skip user implementation or fail to compile
UE - Gameplay - Feb 25, 2015Character::OnJumped_Implementation() should be virtual or users' custom implementations will not be called. If they declare it with "override" their code will fail to compile. Already fixed in Main ...
Media Player Asset not Playing in Packaged Game
Media Framework - Jun 22, 2016Media asset fails to play in packaged game. There was a bug entered [Link Removed] which is similar, but dealt with standalone play mode as well. The standalone issue seems to have been fixed since ...
Multiple viewports open cause wrong viewport to render in VREditor (HTC Vive)
UE - Editor - Workflow Systems - Apr 28, 2016Having multiple viewports open causes the wrong viewport to be rendered inside the headset. Positional/Rotational tracking is still updating correctly in the preview window. Closing the wrong view ...
Intermittent crash in CacheOptimizeIndexBuffer on Editor startup on Linux
UE - Platform - Linux - Nov 16, 2015Building 4.10 from the GitHub release branch on Linux fails to open after install and instead crashes User Suggested Fix: Switching triangle order optimization off with r.TriangleOrderOptimization= ...
Leading space in front of block comment above UCLASS Macro prevents compile
UE - Foundation - Core - Dec 4, 2015If a block comment is used above the UCLASS Macro, leading spaces before the start of the comment causes UHT to fail and the solution to fail compile with a "Missing 'UCLASS' in Class declaration" e ...
Crash when loading TM-MotionControllers in a packaged build
Docs - Samples - Oct 26, 2016Packaged QA Game crashes when opening "TM-MotionController" This issue did not occur in 4.13 This is also affecting KiteDemo. Cinematic will crash when Editor Content is not included in the packag ...