Here are a few steps to help diagnose your issue.
#1 - Hit Refresh
#2 - If you're using IE9 and seeing that message for IE7 users, likely you are running in compatibility mode. To ensure you're running as IE9, be sure the compatibility icon isn't toggled.
Or hit F12 to open Developer Tools and make sure you're running in IE9 mode.
#3 - Hit Refresh
#4 - Try Firefox, Safari, or Chrome and see if those browsers have the same problem.
If you're still having trouble, please post a screenshot here and I'll take a look.