Toon Boom Drawing Bug

Hello. I got the Toon Boom Animate Pro 2 Demo. I really liked the software so I got the full version. When I saved and came back, all the drawings that I made on the project were missing, but the timeline still showed that they were there and not hidden because of the check-mark. I went back to the Demo to see if I had the same problem and I did. Could this be something wrong with my computer, or did I do something wrong when drawing. Thanks!