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I too am having a problem with a black screen after logging in to a Windows 10 VM. Ctrl-Alt-Del will give me the usual options but selecting Task...
I had similar problems but nothing suggested worked. In the end, I reverted to a 6 month old snapshot. Not a major issue as it's not a critical...
I have just installed Mint 18 under Parallels (from the Linux Format cover disk) and, to begin with, it ran like a dog. This is on a Macbook Pro...