Same problem here.
I'm using mac wired keyboard
I'm having also a weird problem, I use KeePassX to manage credentials, since I upgraded to parallels 10 the copy from that particular program results in a empty clipboard in windows, all the other mac programs copy/paste normally.
UPDATE: Just installed version 10.0.1 (direct download from parallels site) and the KeePassX problem disappeared.
Last edited: Aug 29, 2014