Unreal Engine Issues
Unreal Engine Issues
Initialization error when creating FEventReply objects from Python
UE - Editor - UI Systems - UMG - Nov 28, 2025the handled value passed to unlock_mouse is actually treated as unhandled, because FEventReply has no uproperty and no Identical()function of its own. Adding WithIdenticalViaEquality can fix this is ...
Interchange Runtime .glb Import Crash When Packaged
UE - Editor - Content Pipeline - glTF - Jun 10, 2025The runtime import process works fine in editor, but fatal error when trying to do so with packaged build of project. My function that calls ImportAsset():bool UMeshLoader::RequestMeshLoad(FString ...
Niagara and Groom causes exception crash on Launch when using
UE - Simulation - Physics - Mar 2, 2020Trying a Launch after every step shows that the problem occurs as soon as the GroomAssetSystem is added to Niagara. If the GroomAssetSystem is removed, the game launches fine (but the hair doesn't m ...
Start time of subtitle gets incorrectly modified at runtime
Tools - Apr 14, 2016The time field of a subtitle is incremented incorrectly at runtime. This is caused by the wrong array being modified by the subtitle manager when queuing subtitles. A fix is provided by the licensee ...
Viewports: Marquee selection always selects skeletal meshes in ortho viewports
Tools - Apr 16, 2015Box select always selects skeletal meshes in ortho viewports, even when not touching the actor. Switching on Strict Box Selection fixes it as a workaround. ...
Steering feels sluggish in VehicleGame
UE - Simulation - Physics - Dec 22, 2016REGRESSION Yes, does not occur in 4.14.2. Steering in Vehicle Game feels very sluggish. Turning is slow, and the buggy loses a lot of acceleration. ...
Cannot delete Notifies from Anim Notify Manager
OLD - Anim - Jan 4, 2017Cannot delete Notifies from Anim Notify Manager. Regression: YES Broken: 3224400 (4.14.1) Worked: 3172292 (4.13.2) ...
Crash after entering DebugCreatePlayer console command on Sierra Mac in -game
UE - Graphics Features - Jan 18, 2017This is a regression from 4.14.3 This crash does NOT occur in PIE or Standalone Game This does not occur on an El Capitan 10.11.6 MacbookPro or on Windows. ...
No additional ticks appear on the timeline when you zoom in
OLD - Anim - Jan 26, 2017No additional ticks appear on the timeline when you zoom in Regression: YES Worked: 3172292 (4.13.2) Broken: 3249277 (4.14.3) ...
Animations don't respect Restore State when they are part of a Shot/SubSequence
UE - Anim - Sequencer - May 25, 2017Animations don't respect Restore State when they are part of a Shot/SubSequence Regression: YES Broken: 4.15 (3450819) Worked: 4.14 (3249277) ...