another thing that might help us help you, is
do you or have you changed the Video settings ( from the AH Log-In clipboard screen )
specifically, have you changed the "Field of View" view angle settings, if so try clicking the set automatically checkbox/button and let AH pick it up on what the Monitor needs....
this to me seems like it might be your problem........ just a suggestion....
might try deleting your video8.cfg file since you have a new monitor and let AH reload it automatically with the new monitor settings....
hope this helps