instructor

I downloaded the free version in April of this year. I use the Olympus Digital voice recorder to audio record my classes. WavePad made editing recordings possible. Over the summer, I found WavePad straight-forward in editing of spoken information and the recording of CDs for students. I intended to work the recording / WavePad technology into the faculty training of colleges and universities with the Master's Edition. However, as I start the first week of the new semester, before I could purchase the Master's Edition, my files are self-destructing. I open a file, edit the file, close it, re-open the file to continue -- and I see the file went to a flat line. Silent. Zero. This negates months of work to prepare for this semester. Hundreds of hours. If I send the money for the Master's Edition, will a technician direct me to a solution of this disaster? I backed up all my Olympus digital files to DVD. As I type this note, I am backing up all of my WavePad files to another harddrive. I cannot continue working with WavePad -- nor will I recommend WavePad to other instructors in colleges and universities -- if the program wipes out months of work due to inexpliquable failures. Thank you