Hey thanks for the comments and additional ideas! A followup... I ran into the problem again - after deleting the temp files (which cleared things up), and then defragging the POSER disk (it is installed on it's own 120 GB disk). So I then tried the "CLEAR SWAPFILE" idea (setting it to a low number, rebooting, setting it high and then rebooting). And the problem initally was still there - and then went away. Very frustrating. I would pay $$$ for a solid P4 and PP. Of course the other problem is the way the UI just dies from time to time - for example when you are in RENDER/MATERIALS and click something too many times and there are suddenly 2-3 file menus open, etc.... Anyway, the frustration is worth it, IMHO. Lou