Based on the responses in this thread I finally jumped onboard and patched my Poser and now I regret it. Everything is S---L---O---W!!!! I have a P4 2.53 GHZ, 1GIG Rambus 1066 High Speed Ram, Windows 2000 SP4. Things were working allright, with the unusual render lock once in a full moon. Now Poser feels slow as mollasses, what the heck happened??!! Just browsing thru my library brings the eyeglass everytime, scenes I could manipulate with ease now feel much slower too. I wish I could uninstall this servuce pak and go back to SR3. Was SR4 optimized for slower computers maybe?