Loosing Audio Files after import Session Data

[deanguidry]

I'm on pro tools 7.1, 002r running core 2 duo intel with windows xp sp2. I'm still hesitant to upgrade to even 7.4. But for Start/Stop/Pause issue, system has been real stable.....until yesterday. I imported session data from one hard drive onto a new one in a second hard drive. I selected option to "copy from source drive". It worked fine and always has. However, after recording a screaming guitar solo yesterday, my co-engineering opened the session today and tried to record a base track and there were absolutely no audio files in the session at all. What's up with that? I seem to recall a mention or two about this bug somewhere in the forum, so can any one point me in the right direction for a fix or have any suggestions. The files must still be on the drive onto which they were copied and imported, but how to restore? Help! Thanks.