Daniel,We are trying to reproduce the issue you are having. We cannot get our windows to cut-off the lower half like you are seeing. We have themes turned off and running a resolution of 1920x1200 on a Dell Inspiron 8600 laptop with a 64 MB video card. Here is what we are seeing:

There is no logical reason for the window to be cut-off since we are not resizing anything. Can you think of anything else we can try to reproduce the problem?
Are you running some type of service that sits on top of the windows forms like TweakXP or anything?