I've noticed that when I'm in the openGL texture mode in Bryce 5.5 and I rezize to a large document size for a print quality render it tends to seize and lock. This is the only lock I've ran into. The old Bryce 5 never did this. Keep in mind I'm using a fairly decent workstation ATI X2 card with 256 megs of RAM. Other then that, I'm pretty happy with it for a .5 release. I do think the openGL could be much better. Poser 6's GL preview is lightyears better as well as other 3d programs. You don't really get much of the preview for the textures on objects. It's more of a indicator of the lightning in the scene.