If you are experiencing problems with your WordPress site even though you haven’t changed anything then your issue could be a little known jQuery compatibility issue. The latest jQuery update ver 1.9.0 has a number of conflicts with WordPress 3.5 and this could throw your WordPress theme out of sync. We suggest that instead of using the latest version (say from the Google repository) that you revert to an earlier stable version(s) such as:-
You can find all the jQuery Google Repository versions here:-
You’ll find that this magically springs your site back into action. Hopefully the WordPress and jQuery teams will get together to get these inconsistencies ironed out asap!