Sweet pea, my computers fucking rock...best of the best, and I've STILL had that happen! Been working on something for 5+ hours...just kept it up on the screen and took breaks, then had the whole thing deleted...and had effects that were awesome on there that were accidents, so I couldn't mimic them again...That stuff just comes with the turf...Part of doing art on a computer. Just got to keep on and not let it get to you to much! Sorry though...I know the feeling! =/