[V5V]

I just came across this old thread by accident while searching for something else, and feel like I should fill in how the story ended in case anyone else with similar problems reads it.

I eventually found a reference on Avid's web site to problems with certain Core 2 Duo CPUs. It turns out the Mac I was using had one of the CPUs that doesn't work with more recent versions of Pro tools.

About a year after this rant I got a new computer. Pro tools is working fine on the new machine.

Special thanks to Jeffro for assistance with reinstating my plan, which allowed me to move to the current version.