The text layer was built up days ago (only one layer, 10 seconds), with a Sequence Behavior, Spread was set to 17, was playing OK at the beginning, started to crash or freeze last night, just couldn't touch it again, check photo, http://zmupicture.com/screen.jpg
This MacPro 2.8GHz 8 Cores only 3 weeks old with stock Graphic card, 6G Ram, Activity Monitor shows 95% CPU idle, less than 2G Ram used when crashed. In FCP6, it shows "Out of Memory" when 95% CPU still idle. All imported .mov from Motion played very slow (HDV File), need render. VisualHub encoding was VERY FAST, it was using 40-60% of CPU! Why not FCP and Motion?
Tested Hardware, normal, Disk utility shows normal.