Unlike my Windows VMs, my MacOS installations were partially created by simply cloning an older OS and upgrading it in the cloned VM. Unfortunately, every time I startup the cloned VMs I get some sort of error along the lines of "can't use this VHD", but it can be closed and I don't notice any problems. The only thing I know for sure beyond that is that the packaged VHDs all appear to have the same contents, name and all. I'm not sure if I'm getting this message on the original VM or not right now, but there's a chance it had the issue and I didn't think about it. Additionally, NONE of them will create a Snapshot as well, so I suspect there's a common culprit there. Other than that, would there be any reason that I couldn't have just used the Finder to copy/rename the VM and just drag it to the list in Parallels? One thing that comes to mind is the VM's MAC address, but I'm not sure how that's handled.