I seem to having a similar issue after upgrading. When I use the menu option in backtrack, I get an empty /media/Parallels\ Tools. And until I get these installed, I'm stuck without startx....
Update:
Well, after working on this for a few hours, I got it mounted manually... had to mount /dev/sr0 to /media/cdrom myself (on backtrack), and I found that the iso is kept in /Applications/Parallels Desktop.app/Contents/Resources/Tools/prl-tools-lin.iso instead of the old /Library/Parallels/Tools.
Last edited: Oct 21, 2012