Yesterday, when I was about to render a project to a WAV file, after I chose File/Export Audio to desktop an error came up saying something like a "Catastrophic Error has occurred.  Mixdown cannot be performed! "  I may be paraphrasing a bit there but that was essentially the message.  I rebooted my PC and went back into the project and tried again with success, but I'm wondering if I got that error because maybe I forgot pick any tracks to bounce (which is a possibility).  I remember when I use