Just for additional information, should anybody search and find this topic as I just did:- My system suddenly started doing this when I render to 1024 x 768 in a new window. I tried the Curious Labs recommendation above, and it worked. ;) I should make clear that I didn't have a pagefile on the disk where Poser is (it has a separate one to the rest of the system), so I had to create one. I gave it a minimum of 10, maximum 1000. Poser 4.03, Windows 2000 Pro; 512MB RAM, about 11GB free on the Poser disk.