Crash repeatedly when applying a Texture 2D for Displacement

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!

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?