I had this recently. I had fiddled with the VM settings after changing my USB settings so that I got an error message when starting my VM.   In my case this happened when my XML got corrupted in v 6.8.0 (and the result was the blue-screen you got). Whatever you do, DO NOT erase your vdisk and DO NOT erase your VM.   Backup your VM XML with the new app that is available. I excluded backup of the vdisk (only doing XML file bakckup), but keep the vdisk untouched and DO