Poser 5....Poser 4 locks up too much - wheras P5 SR4.1 has the memory leak that caused so many P4 and Pre-SR4 P5 problems. Truth be told THIS is the fix which makes Poser really WORK for me - I might be tempted to use Poser 4 more if it had this memory leak fixed (assuming that was enough to make it as stable as Poser 5). As is, Poser 4 is crippled both by lack of functionality (textures! No Materials Room!) and by comparative instability. Cheers, Cliff