Deleted audio in Adobe Audition CS5.5

While using Adobe Audition with 3 different audio files in the Multitrack, I found that the system had suddenly deleted half the audio in one of the files. At the 40 minute point of the audio, the file was just silent. No amount of amplifying could reproduce the audio. As well, when mixing down just prior, it had given me a file with audio wave forms, but no sound. Upon saving that file and rebooting the computer, I found the file to now also be completely silent, and without wave forms. I'm not sure anything can be done now, just curious if anyone else has had this issue, and if it relates to the recent Apple updates.