For some people rebooting the PC seemed to help. I was probably the one who suggested pz3 corruption, but that was just just speculation at the time. The "C exception" window is actually a piece of debugging code that CL seem to have seen fit to leave in the patched code. The same problem may well have been occuring in the unpatched version, but it now gets reported rather than just causing a render freeze, which will give CL a better opportunity to trace the cause of the problem. Bill