The fix is to turn off Compatibility Mode. For IE9 it's the small broken page icon in the address bar. Click it to toggle it on/off, solid color is on, greyed-out is off.

 

Look up Compatibility Mode in the browser help files to if you want to know what it is. Basically, it "lies" to the web about your version of IE in order to work with wonky code (or, depending on your point of view, in order to make IE work with standard code).