Unreal Engine Issues
Unreal Engine Issues
Null Material Layers in Material Instances cause Opacity Mask and WPO to break on Nanite Meshes
UE - Rendering Architecture - Materials - Oct 31, 2024When a Material Instance is loaded that has a nullptr layer in StaticParametrs.Materiallayers. The Material Instance will create it's own CachedExpressionData but the ConnectedParameterMask will be ...
Swarm Agent Binaries Missing in Launcher 5.7 Preview
UE - Foundation - Build - Rocket (Installed Engine) - Oct 23, 2025The Swarm binaries are missing from Engine\Binaries\DotNET in the 5.7 Preview launcher version of the engine. This causes any lighting build or precomputed static visibility builds to fails due to t ...
Visual Studio opens unnecessary windows when adding a new C++ class via the editor's interface
Tools - Oct 25, 2017When adding a new C++ class to a project via the editor's interface, Visual Studio is opened but it ends up opening more than is necessary. Firstly, Visual Studio is opened without focus on the two ...
[CrashReport] UE4Editor_LevelEditor!FMulticastDelegateBase<FWeakObjectPtr>::RemoveAll() [multicastdelegatebase.h:81]
Tools - Oct 26, 2017This is a trending crash in 4.18.0. One case of this callstack occurred in 4.17.1, but then numerous have occurred in 4.18. Users have not provided any descriptions of their actions when the crash ...
Tabbing out of exclusive fullscreen leaves the window & backbuffer in an incorrect state
UE - Editor - UI Systems - Apr 24, 2020With windows 10 there has come some new swap chains, which unfortunately messes some things with regards to fullscreen up. We've fixed a bunch in the renderer (which would downright cause crashes), ...
SetActorLabel resets components when run outside main editor process
Tools - Mar 30, 2015Calling SetActorLabel causes an actor's components to return to default states when called from a client accessing a listen server outside of main editor process. Note: User posted code linked to ...
Possible data loss/corruption when loading levels in editor
UE - Gameplay - Jul 18, 2018Reported behavior: Given Level_A which contains object_X, where object_X references Level_BDeleting object_X causes AssetRenameManger to check if we need to patch up other levelsLevel_B is load ...
Failure to sign when packaging for iOS Distribution when using Remote Compile from a code project on Windows
UE - Platform - Mobile - Feb 20, 2019Packaging for iOS Distribution from Windows using Remote Compile results in a failure during the signing portion. This seems to be caused by a hardcoded "false" for a property that is used to determ ...
SketchUp UV scale is not consistent for Datasmith imports.
TM - Interoperability - Dec 6, 2024This is not a regression. We have 2 issues here. First we have different tiling for the different materials, since the way sketchup handles texture scale. They scale the UVs of the object instead ...
[CrashReport] Crash on Mac due to uncaught exception 'NSRangeException' - HIToolbox!DispatchEventToHandlers()
UE - Platform - Apple - Jun 22, 2017This is a common and longstanding community crash on Mac. Users have not provided descriptions when they crash, so additional information is currently not available. A log file is attached. Call ...