By your crash, thread 0 shows the problem. 1. do this. Open your Macintosh HD (boot drive) open Applications \applications\Library\Application Support\Digidesign\ Move that folder to your desktop do not delete! Then you will boot. Now the hard part Create a empty folder here \applications\Library\Application...

Hi Marianna, I would have no issue purchasing MC v5.5 and then getting v4 in the process. The only reason I am reluctant to dump a lot of money on v5.5 is that I have a big concern whether my iMac, which I purchased in early 2008, is even capable of running v4. I already have 4MG of RAM which is required...