Session File Crashing on Start with C1-7

Used the software extensively yesterday on a corporate shoot with only two crashes. one while opening a file in PS CS6 and another while trying to use the crop tool. Love the new engine and images present wonderfully on our MBP Retina display- 10.8.2.

However this morning the session file crashes on start-up. any suggestions? Other sessions start-up fine. Is there a way to rebuild the file?

Thanks!