Crash repeatedly when applying a Texture 2D for Displacement

Development Asset Creation
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1

Any Unreal Modeling Mode experts?
I’m trying to apply a 2d Texture Displacement to a simple mesh but repeatedly crash the moment I actually apply the Displacement Map Texture.
Even before I click ‘Accept’ in the main window and with 0 subdivisions!
Its the generic 'Unhandled Exception > Exception Access Violation ’ error. UE 5.1.1

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address
UnrealEditor_GeometryCore
UnrealEditor_MeshModelingToolsExp
UnrealEditor_Core
etc

Tried several times, and tried deleting my DefaultEngine.ini file as well.
Using Perlin Noise as Displacement Type works fine.
Any troubleshooting steps appreciated!

2

As an alternative can any Modeling Mode experts tell me which tool I would use to simple break up a mesh?
ie given a cube as a single mesh, how would I break up so that it becomes 6 separate meshes?