Any tricks to getting this configuration to work? Both host and guest have latest version of mountain lion, and Parallels 8 is up to date as well. Computer is a 15 inch Retina MBP. All settings are default from setting up the VM. Guest OS is very unstable, and will simply hang at random intervals, requiring that the VM be stopped and restarted. No clear pattern as to when or why it hangs, but it rarely lasts longer than 30 minutes of run-time before failure. No stability issues on the host machine. No stability issues when running other guest systems, including Windows 7 and Ubuntu. Any thoughts on how to get this running reliably?