ImDisk hang during DISM apply

A possible bug in ImDisk 

Situation :

• Running windows 8.1 u1 x64
• Mounted Vista x86 SP0 ISO (wondering why?   ) to H: 
• Mounted partition 3 of GPT partitioned dynamic VMDK using ImDisk Utils to letter R:
• Formatted volume
• Tried applying H:\sources\install.wim using dism to R:
• Hang

This is the worst possible sort of hang, that reveals NO anomalous CPU | RAM | Disk | Network usage at all... Things seem to work normally, but trying to close some/any open applications results in freezing. CANNOT terminate any frozen process (have seen 1/2/3 such affected processes), has no effect. Ctrl+Alt+Del works, but signing out does not... Hard power off is the only option...

The EXACT same thing with VHD attached in Disk Management, works perfectly fine...