Mac PP CS5 not using all CPU anymore

All,
I was a cutting a project a while back and put it to the side for a while. I just went back to it and asked Prem to render the work are and was surprised to see it taking forever. I opened the CPU perf view and found hardly any CPU being used. I have a MacPro 2.9GHz 12 core machine with 48M memory and the project drive is a striped set of WD Caviar Blacks. Not only is the machine not breaking a sweat its not even getting out of bed.
Yes I have installed Apple patches since then and some software. PPCS5 is up to date. We I was using the machine a while back it was firing on all threads and cores.
Has anyone seen this before?
Jim

Hi Bill,
Thanks for your email. Yes I did try PPBM5 with some success. Separate to this I decided to let the render run from end to end on my project to see what would happen. So what I saw:
- first 600 odd frames very quick (very = blindingly)
- then it got to 900 odd frames very quick but then came back to the 600th odd frame where each frame took minutes to render for about 60 frames.
- all this time the machine didnt break a sweat,(basically flatline).
- after the slow 60 frames all the processors came to life and for the rest of the render (thousands of frames and multiple sequences) and it was rendering normally
Im trying to figure out what those 60 frames were, as I cant see anything overly complex there that would mean PPCS5 would fail to use all the CPU available (if anything 1 core jumped up every now and then).
Thanks

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