Upgraded from 12 to 13. No errors during installation. Started Parallels and get, not one, but TWO message pop-ups that state: Unable to connect to Parallels Serivce Make sure that the prl_disp_service process is active and it is not blocked by Firewall. For details, please refer to http://www.parallels.com/products/desktop/supportinfo/pdfm13_en_US_249 NO firewall service running. Followed the stop/start launchctl as per the referenced link in the error dialog. Still doesn't work. Removed the installation (dragged to trash, emptied trash) and rebooted. Tried installation again. Same exact response. Rebooted again. Same. Sent problem report.