Um, why are there no upgrade instructions within the 5624 dmg? Are you supposed to shut down your OS images before the install or anything? Hello?
The update was a nightmare... Unbuntu and no other images would launch AT ALL after the update to 5624. I would get nothing but spinning beachballs and would have to force quit Parallels after trying to start up anything.
I was able to uninstall the update and reinstall Parallels back to 5608 and everything is back to normal and all my images appear unaffected by the crap and now start. BUT, now there's no Parallels tools installed with Ubuntu 8.1, so I can't run it as integrally with OS X at all.