losing tracks when switching between sessions

[Tommy Dunbar]

I have been switching between sessions in 88.2 and sessions in 44.1 several times a day in PT8 HD. I often lose tracks upon switching between sessions. For instance, I'm working in a 44.1 session, then I switch to an 88.2 session, and half of the tracks just don't sound. The meters don't show any activity either on the non-sounding channels. If I restart my Mac I can then start Pro Tools and everything works fine, but it's annoying to have to restart everytime, especially when going back and forth between session several times an hour.

Has anyone else had this problem?

Thanks, Tommy