I had this problem once - And as far as I can remember it I deleted (to RecycleBin) some file that were only on Poser3 - Not Existed on Poser4 any more (I Think). Delete the files that have 640x480 or 800x600 the same file with your Screen Resulution and try to make poser create a new one (Also need to delete a current file). I know I did that and Poser3 comes back to life - Till Poser4 Came along and killed it :). Your Friend Arye Guetta Hope I helped