I'm using IE 9. It's not all of the time, but about half of the time clicking the back button does nothing. I don't have this issue on other sites. It's not a big deal, but I saw someone else say they had it happen to them too.
The back button not working is google ads loading up. About 30 or 40 ads worth. Click on the down arrow (history track button) by the back button and you can see what is loaded on the page. It doesn't do it all the time for me either, but when it does just click on the buttpn and you can see what's loaded. This is on IE9 and Maxthon for browsers.