Unreal Engine Issues
Unreal Engine Issues
Iris - Missed subobject destruction can cause incomplete client state
UE - Networking - Iris - Oct 7, 2024From UDN assigned to [Link Removed] ...
Vector VM - Crash / memory stomp when using > 255 external function calls
UE - Niagara - Aug 12, 2025The Vector VM has only every supported a byte's worth of external function calls, when we blew the limit it would index into the incorrect VM call. The new VM will also overwrite memory when exceed ...
Deadlock while cooking groom bindings
UE - Runtime - Deformable - Jul 14, 2026Hi, we are experiencing random deadlocks while cooking groom bindings. We have integrated 5.8 mutable into 5.6 and are still experimenting those deadlocks which seem due to : UE_DEPRECATED(5.4, "Th ...
Sequencer crashes when using Transform variable added to Scene component BP
zComponent - Archive - Oct 18, 2021This issue has not occurred in previous versions and seems to occur from 4.27. ...
Reset Instance Changes to Blueprint Default does not revert changes made to instances
UE - Gameplay - Blueprint - Sep 15, 2015creating an instance of a blueprint and making changes to the instance will not respect "Reset Instance Changes to Blueprint Default" when pressed from Details Pane. ...
Timeline name changes do not propagate to related nodes
UE - Gameplay - Blueprint - Mar 17, 2015Timeline name changes do not propagate to related nodes. Refresh All does not rename nodes that reference the timeline, and Getters and Setters are no longer valid nodes. Reproduced in 4.7.2 binary ...
LIVE: Print string not working when nav mesh bounds volume information is pulled up
UE - AI - Nov 12, 2014After place a Nav Mesh Bounds Volume into a level, launching the game and pressing the [ ' ] key to show information about the Nav mesh the print string stops working. If the User closes the game w ...
Enabling World Composition Skips Intro Movies
Tools - Jun 24, 2016Startup movies are skipped when World Composition is enabled. Even with the 'Wait for Movies to Complete' option enabled, the startup movie plays for a very short time, and then the level is loaded ...
A Pass-by-Reference function input cannot accept a reference to Self
UE - Gameplay - Blueprint - Dec 30, 2014A Pass-by-Reference function input cannot accept a reference to Self. Workaround: Cast from Self to the desired class and use that for the function's input. ...
Looking at several BPs during play, that add multiple static meshes in construction script, drops the FPS
UE - Graphics Features - Jan 9, 2015Looking at several blueprints during play, that add multiple static meshes in their construction script, drastically drops the FPS. As a workaround, I suggested to the user that he should use Insta ...