UPDATE
I found a way to roll back my new Mac Pro to OS X 10.5.8 (crazy process involving a Macbook, removable hard drive and disk imaging tools) but now EVERYTHING WORKS. Rolling back literally solved all of my problems in one fell swoop.
/UPDATE
Well, I'm at the end of my rope. After a week I've determined that Adobe Prem Pro is fundamentally unstable under Snow Leopard - OS X 10.6.
I'm getting constant freezes and complete crashes (no hang up, the program just VANISHES and often corrupts the project file in the process).
I can't even get a clean re-install of the program because the Adobe Clean Script utility doesn't detect the previous installations (despite them being there as there is carryover of program prefs, custom bins etc).
I'm at the point where I either:
a) Do a clean wipe of the drive, reinstall Prem Pro CS4 again and see what happens.
b) Roll back to OS X 10.5 and pray it resolves the issues.
Has anyone had any experience with either solution?
This is extremely dissapointing as Adobe has been vociferous in the contention that the CS4 suite is now working with OS X 10.6. It simply isn't true and borders on criminal business marketing on Adobe's behalf. I feel like they're telling me: "Who you gonna believe? Me or your lyin' eyes?" ;)
UPDATE: I've opened a bounty on this question. Specifically, looking for a resolution of the crash on importation of any still image under PremPro CS4.