Thanks Jim,
When I uninstalled and re-installed, I removed the prefs along with it. i DID however sync them back when I opened the fresh copy..
From what I had gathered though, the MP settings don't get synced anywhere, so i figured that was safe.. maybe not?
I've at least made some changes with MP off, using a previously rendered proof to cover most of the comp and splitting it to show the changed layer below when changes were made.. this got me a deliverable for today's deadline, so I'm not in rush mode anymore.. but this still needs some research to fix..
I'll update if the other suggestions help.