KDE Can't Move Windows

At work we just upgraded to Red Hat Enterprise Linux 4 on all the workstations. People have been having some issues with it. One of the major issues is that some people can't move their windows. The problem seems somewhat intermittent. You can be using your desktop normally, then after some period of time, you stop being able to move the windows. This has been hitting many of our users. After some searching on the web and through some forums, I found a way to restart KDE without restarting your X session. If you do this, it seems to keep all your windows up and fixes the problem where you can't move your windows.

The other problem that we're having is that when you run a vnc server on :0 with the vnc module in the xorg.conf, it doesn't redraw unless you move the mouse. This makes it very difficult to do much real work on it. I heard one report of a lady who was working at home over the vnc connection, and had to have one of her co-workers log in to the same box and consistently move his mouse so that her screen would refresh while she typed. If anybody has any information on how to fix this, I'd be extremely grateful.