paulbzero on "Gibberish on home page"

I have a problem where the index page just shows a bunch of gibberish characters. If you go to breatoastmasters.org you will see my problem. I can access the wp-admin site with no problems, and all my pages still exist.
Thinking this might be a PHP problem, I downgraded to 5.2.17, but am still having the same problem.
The index page was working correctly a few days ago. Any ideas?