Camtasia 8.6 created a camproj file (90kb)on May4, 2017. But now (May 12) gives a false error 'This project was created by an earlier version....', and offers to convert. But the 'converted' file has only 5kb, and has no videoclips when opened There should be about 10 clips. I have not changed any versions of Cam Studio recently. How do I recover? Help please.