The lsregister-trick works for me (Fusion 6 Pro)
Quit Fusion
"...lsregister -u /Applications/Cubase 7.app"
Start Fusion
"...lsregister /Applications/Cubase 7.app"
After this Fusion normally works for a week or so, but for some reason the problem eventually comes back but repeating the procedure has so far fixed things for me.
VMware needs to fix whatever is needed or at least document the problem.