Ultra VNC Wrong Machine Connection

Hello people. I had a great experience after deploying UltraVNC. It was working great, and I had done the deployment through Group Policy. Everything is fine except for a tiny glitch. When connecting to a host it connects me to the wrong machine. I enter the name of one host, and I end up being connected to another. However I must add that for some machines it has been working perfectly well. The only category of machines that it is not connected accurately is the CAD lab. Thanks much. Jane.
