[janmuths]

Hi there,

I'd strongly suggest a clean re-install. Update the OS via combo installers first. Repair Disk permissions. Then install PT. Repair disk permissions again. For some of your plug-ins you may be able to copy - paste from an old PT installation. Check plug in versions against the compatibility grid on the avid website.
Usually plug ins that use iLok licenses and do not require external content work after copy pasting them once you plug your iLok in.
Plug ins that require serials or challenge/response do usually require a clean re-install. That's the case for my IKMultimedia stuff for example.

Am running PT10 on Lion and no problems so far.

Hope this helps.

Cheers,

Jan