Nothing there when I open a "session"

Okay, so I was working with an mp3 and I used the Center Channel Extractor to create an a cappella version of one of the verses. I saved the "session" and now when I click on the .sesx file Audition opens up but there is nothing there. No waveform, nothing. Where does my session go? Why can't I just open up a project (yes, I know they are called sessions) and continue where I left off? Is all my work on this track gone?