Hello again. Thanks for quick responces. Yes it is running on Windows 2000 Pro and I did try it to set it to run on just CPU1 instead of CPU0 and CPU1. It is still does not work. I am guessing that it might be AGP slot drivers or chipset on the motherboard. Let me know if you have more ideas. Thanks.

I have DUAL XEON 2.4 GHz System with GeForce4 Ti 4800 Video card. Whenever I am trying to use MasterCam v8 or v9, the screen does not refresh. In other word, I can open project that was done previously, but when I try to use toolpaths the screen freezes and the only thing I can do is close mastercam and start all over again. The weird thing is that it works fine with 256 colors, but does not work with 16-bit or 32-bit. The computer always works fine. Even when mastercam does not refresh the screen, I can switch to other programs. The motherboard is SuperMicro X5DAL-G with AGP 8X Slot. I know that it is not the video card, because I tried it on the other computer, basic Pentium III and it works fine. Any suggestions?