vmdk client hangs but runs if a remove/recreate same vbox client.

Manjaro host vbox, won't run Endeavour guest, guest boots to a "schell>" prompt. If I create an exact duplicate client (With a different name:-)) it boots fine using the same VMDK (raw metal) access file definition. Aparently vbox is "hung" or remembers something that I would like to reset. I have even released the vmdk pointer file, and removed the failing client, deleting all files of the failing client vbox entry. Then rebuilt using the same client name and the client now works.
Is there a way to reset the client so it is no longer hung ? ( tried renaming ~/VirtualBox VMs/client/vbox.client to .old and renaming vbox.client.prev to vbox.client to no avail.)
Is there a way to reset the client so it is no longer hung ? ( tried renaming ~/VirtualBox VMs/client/vbox.client to .old and renaming vbox.client.prev to vbox.client to no avail.)