Hey, I discovered that it's definitely not a disk space issue - it's a codec issue. I cleared several GB's from my C drive (ahh...it felt good) and the problem still persisted. Then I changed codecs. I had been using the codecs for my real time nle system (Matrox rt2500) and it didn't like them (bummer - that means I can't edit Vue animations in my NLE system realtime). When I switched to several other .avi codecs, including "uncompressed", it rendered fine. Also, it didn't like making QT files. I have QT 4 pro, but it is telling me I need to reinstall it. I don't know why, since all QT files and player work fine otherwise. Any thoughts?