Replying to PMing not working

So as of today, I've received a few PMs and when I go to click on the inbox in the upper right, or the members name who sent me the message...nothing happens.  Today I had to search their name in the searchbar, find their profile, and click on message exchange.  I'm running the newest Firefox on a Mac if that helps.  (Firefox has been screwing it big time lately with a few other sites too, including chatting on facebook)

Just thought I'd bring this to your attention.