Unreal Engine Issues

Crash when AnimBlueprint and Bleuprint Interface has Same Name Function

When AnimBP and Blueprint Interface was added to the AnimBP has same name function, compiling AnimBP occur crash. ...

Crash when enabling Shader Complexity Viewmode

Material Editor Assertion Crash When Collapsing Material Attributes

Collapsed material attribute nodes cause an editor assertion crash in the material editor when viewed or opened. Assertion failed: (Index >= 0) & (Index < ArrayNum): Array index out of bounds: 0 fr ...

Crash When Setting a Bool in a Niagara Parameter Collection via Blueprint

The Editor will crash when setting a bool in a Niagara Parameter Collection via Blueprint. Found in 4.20 CL# 4369336, 4.21 CL# 4753647, 4.22 CL# 5159901, 4.23 CL# 5194133 ...

Crash launching UE4Editor.exe from cmd.exe with -dx12 argument

My Nvidia driver is our current approved driver: 378.49 ...

ARCore fails to package due to permission error with ARKit enabled

When using the handheld AR template and trying to package for ARCore, the package or launch on attempt will fail due to some permissions errors with Apple. If ARKit is disabled the editor will lock ...

Crash when baking materials for some skeletal meshes (like those found in Epic's Car Configurator project)

FMeshMergeHelpers::RetrieveMesh crashes when trying to prep some skeletal meshes for material baking. ...

Crash after removing decal (using set fade out node) during design time and then hitting play

When calling set fade out on a decal during design time via a custom event that is setup to be called in editor a crash will occur when clicking PIE ...

Crash when generating proxy mesh

Generating a proxy mesh with imported models and the simplify mesh flag set to true causes the editor to crash. Tested in 4.21.2 (CL - 4753647), 4.22.3 (CL - 7053647), 4.23 (CL - 7288428), 4.24 (CL ...

BP - Exclusive nativization will fail at cook time if a BP class includes a ChildActorComponent with a Data-Only BP set as the ChildActor class.

Note: This does not occur when the nativization mode is set to "Inclusive" in the Project settings. Current workaround: Ensure that the ChildActor class is NOT a data-only Blueprint, by adding scri ...