Unreal Engine Issues
Unreal Engine Issues
Nanite TwoSidedSign is backwards
UE - Graphics Features - Nanite - Apr 10, 2025The value of MaterialExpressionTwoSidedSign is flipped when calculating the Opacity Mask for Nanite meshes. This seems to be a regression in 5.5. ...
Sequencer: Camera blends restore to incorrect view target after Keep State
zComponent - Archive - Jan 20, 2026When a Level Sequence’s Camera Cut track with When Finished = Keep State is played, the “original state” is persisted into the PreAnimatedStorage array inside FPreAnimatedCameraCutStorage. From the ...
Crash when switching from Lumen visualization to raytracing visualization
UE - Rendering - Graphics Features - Mar 27, 2026When switching from Lumen visualization to raytracing visualization via the console, the editor can crash to desktop. The crash appears to happen deep within the driver libraries, and does not trig ...
Editor crash when deleting a outline folder with subfolders and using context menu
UE - Editor - Verse Class Editor - Oct 3, 2023A user has reported that when using the Scene Outliner in a large map that has many actors and nested folders in the Outliner, deleting a folder that has subfolders from the Scene Outliner with Dele ...
Crash when applying force on event tick to DM
UE - Simulation - Physics - Destruction - Jun 19, 2015When using a DM and applying force via blueprints with event tick will cause a crash. Workaround: Using a timer instead will not cause any crash even with very low values. Crashreporter: [Link Re ...
Replication default setting of child blueprint resets if parent is compiled
UE - Gameplay - Blueprint - Jul 20, 2015The setting for Replication on a Blueprint variable resets to None of the Blueprint's parent BP is compiled. ...
Changing UPROPERTY() settings causes detail components to vanish in editor
Tools - Mar 11, 2015When a UPROPERTY() macro is changed and the recompiled, the hot reload in the editor will cause any BP based on the class to lose certain aspects of the Detail panel such as the actor's transform. ...
Interface cannot be re-implemented after removal from blueprint
UE - Gameplay - Blueprint - Sep 1, 2015If an interface is removed from a blueprint and an interface function is transferred to a local function, the interface cannot be re-implemented in the blueprint. ...
nonstandard bsp additive brushes cause breaking/artifacting on other bsp brushes when colliding
UE - LD & Modeling - Modeling Tools - BSP - May 14, 2015if a nonstandard additive bsp brush collides with a standard additive bsp brush, the surfaces of the bsps break and artifact, causing numerous holes in the brushes. ...
Editor crashes when attempting to open a new level from a level that has an external curve in a timeline within the level blueprint
UE - Gameplay - Blueprint - Oct 27, 2014The editor crashes when a user imports a float curve into a timeline within the level blueprint then attempts to open another level. ...