The other computers are running IE9? Have you tried the compatibility mode for that site?
There may be some add-on it needs, or cookies may need to be enabled. Is there a yellow triangle on the bottom of the page?
On the bottom of the Home Page, there is a "Viewing Tips" option. Select that and it will check your browser for needed items. Maybe that will give you some indication of the problem.
After the check, there is a technical questions link in the lower part of the page.