I've been playing around some more to try and figure this thing out (trying to reproduce it on cue). 1.) When I boot up the three computers cold, start the application cold, and render, it works fine (so far). 2.) No checkers will appear for a while until I fuss around tweaking whatever I'm working on. Eventually, the system gets to some point where the checkers start appearing. So far, the consistent trigger point is using the "depth of field" option. I don't think the DOF option is solely responsible, I think it simply opens up a memory leak in the code and then I'm doomed! 3.) Trying to render without the raytraced depth of fied on is WAAAAAY painful. Turning on the raytraced depth of field is still painful but cool results. Checkers appear after trying to fuss with this new feature. 4.) I can't get the checkers to disappear unless I completely reboot the computers. I can close carrara on all the machines, restart the application, and CHECKERS! Rebooting the computer from the ground is the only way to return. 5.) Other fun things start happening when fussing with the depth of field option. I change settings in the render room, switch to the assembly room (do nothing), switch back to the render room and all my changes are gone. This is only one example of the interface acting really weird. On a completely separate note (divorced from DOF), I've also had the interface completely stop reacting to me for no real reason. Can't reproduce it. All options turn grey, can't click on anything, etc.. Very weird. I've completely uninstalled C3 and I'm thinking of getting it back out of the box until we get a patch. This is par for the course though. C2 and C3 were just like this and C1 was super bad. We had to get a whole new vendor to get that dude patched. -Kix

-Kix