Separate names with a comma.
It fixed itself after I stopped and restarted the VM. I think it started happening after the latest update, saw it twice now.
Seeing a black screen too for my Windows 10.
I fixed it, I went to Parallels Desktop Preferences -> Shortcuts and added Ctrl+Enter to the list of shortcuts to map. [ATTACH]
Can confirm, the latest update breaks Ctrl+Enter.
Also ran into this. WPF KeyDown event for modifier keys (Ctrl, Shift, Alt) is actually delivered when I release the key, not when I press the key....
