[bukman]

I have exactly the same problem only I am running a Mac Pro.
PT8 LE CS2 OSX 10.5.7.

Session saved fine, I shut down and came back later on and could not open anything. Trashed preferences and still no go.
Usually it freezes on opening overview but sometimes does it while saying it is "Activating Mix L/R"

With me my session is very large and mainly using UAD2 plugins (75% CPU usage on 2 quad cards). If I disable the UAD cards and open the session the Mac just shuts down and tells me to push the power button and restart the machine.
Having to go back to an old backup just doesn't seem right given I have saved regularly but now find despite that the system wont open my saved files.

Digi please help