Terminal Server screen won't lock in windows 7

Hi, my office has a terminal server and every time I launch it with dual monitors the terminal server windows do not lock at the maximum size. I can move the entire terminal server window up and down and side to side just by moving the mouse...it is irritating and not allowing me to use the computer efficiently.

I am hoping someone knows how to resolve this problem. If I use 1 monitor, the screen locks. The other guys in the office with Windows XP do not have this problem either.

Any ideas? Thanks for your help.

Thanks, I re-posted it! Please let me know if you have any suggestions to fix this problem. Its driving me nuts