Good summary ronstuff! I also found that "walking away" and letting it finish "thinking" was more often than not the solution :) Certainly agree with you on XP,the MAT files and "higher than needed for screen use", texture files! :) Lights in general are a problem. The Python script to delete lights solved that for me. I believe it's Ockams. Removing the lights before switching to new ones has saved a lot of "lock-ups" and frustration. My system has never locked up as a result of Poser. The ap had a lot of freeze ups before I started using the delete lights script. Very few now and most related to mats and textures. Oh....if you're rendering to a new screen, don't try to cancel out. That will usually result in a lock up for me. I have Poser patched through SR2. I have not installed SR3 simply because I don't have time to learn its foolish nuances.