Suddenly, my program monitor has become transparent. Instead of my sequence I see parts of my desktop "framed" in the box. When I drag it, repetitive "trails" of imprints of the framed desktop portion start to form like a dragons-tail - as I swirl it about.
Very distressed. My sequence seems fine but I can't watch it. No sound either.
Btw, this happens on other files too, so it seems a product wide happenstance as oposed to just one file.
Reboot. Update the graphics driver.