On MBP, I tried starting-up Compressor but its icon just bounced up & down (on the task-bar) for ages. Attempts to right-click it revealed a “Not Responding” condition. So I searched for a solution. I discovered a check-list Compressor: Troubleshooting basics at http://support.apple.com/kb/TS1888?viewlocale=en_US. From that check-list, the fix that worked was to delete my account’s Preferences for Compressor, as follows:
- In the Finder, go to ~/Library/Preferences
- (where the tilde (~) represents your Home folder).
- Remove the following files from the Preferences folder:
- com.apple.Compressor.CompressorSharedService.plist
- com.apple.compressor.Compressor.plist
I discovered the checklist at http://discussions.apple.com/thread.jspa?threadID=1408723, which also gave some more tips.