Pt8.05 Le freezes when opening session

Hi All, just recently when I open a session my computer it freezes when building mix window. This can happen from 5 to 20 mins but eventually the session opens and runs fine.

I have reinstalled the entire operating system and obviously pro tools too.

I can only think the the mbox 2 is the issue.

Anyone experienced this problem.

All the best, Eds

pT8.05 Le

Mac book pro

OS 10.6.8