Because of a mix up the wife upgraded the Mac to Yosemite whilst I was at work (don't ask, she thought that is what I wanted bless her). As a consequence I have had to purchase PD10 which I didn't want to do (had PD8 previously). Now having done all that, Windows VM is running dog slow - what the heck? Nearly every programme I try to open states 'program not responding'. I am giving Windows 8.1 VM 6 gigs of RAM. To say I'm not amused would be an understatement. Thank goodness PD10 is optimised for Yosemite. The other issue I've got is that the VM won't close properly either. It goes to purple screen with message 'preparing to configure Windows' but never finishes.