Unreal Engine Issues

Crash when starting PIE on a World Partition level with a Niagara Component inside nested Child Actor Components

Consider an actor containing a Niagara Particle System Component, which is instantiated from another actor's Child Actor Component. When initializing PIE on a World Partition level containing this s ...

Anisotropy of base disappears when clear coat is greater than 0 when Substrate is enabled

Anisotropy from the base of a material disappears when clear coat is used. Car paint with base specular_anisotropy at 0.5 and coat at 0.0 [Image Removed] When coat is 0.0: [Image Removed] ...

Editor crash when shader debugging enabled including r.shaders.optimize=0

The editor crashes when activating cvar options for shader compilation and debugging. ...

Crashes when applying material on objects after changing UV mapping parameters with Lumen enabled.

Info from the user: "This is super basic, only just started to build the scene. I have modeled in Vectorworks 2024 Architect and imported it into Twinmotion via the export and not the live link. The ...

Search in Blueprint can encounter a deadlock condition when the window is closed before the search finishes and an FText lookup is pending

When a running search in all blueprints is closed, it may prevent an AsyncTask used to return the look up FText's from StringTables from running on the game thread, leading to a deadlock. When the ...

Installed Editor doesn't package the right target if Marketplace plugin are installed before first launch

Something is wrong with the TargetInfo.json file generated when they are some Marketplace plugin installed. The client reported this workaround:  Backup the plugins found in Engine\Plugins\Marketp ...

Renaming Niagara's emitter name in the Timeline panel causes a crash

Renaming an emitter's name in Timeline panel of Niagara editor causes an editor crash. This happens because FViewModelHierarchyOperation constructor is called with null InAnyModel ptr; FViewModelHi ...

Crash on Unreal Editor Exit due to subclass of UEditorUtilitySubsystem

Since UE5.4, it has been reported that if there's a class derived from UEditorUtilitySubsystem, the program crashes when the editor exits. This is because the code added in CL30853505 accesses freed ...

Weightmap painting on 2x2 subsections causes offset depending on which subsection painted on

UMG: crash when a namedslot has content in a widget blueprint and its instance

workaround: open WBP_A and remove its namedslot content to avoid having two contents in the same namedslot. ...