The .live() method is deprecated as of v1.7 (I think?) and as of 1.9 is removed. Just upgraded to WP 3.6 and seems it’s using 1.10 (which I did not know existed) but with a backwards-compatibility file. Just thought I’d give you a heads up since I’m guessing it will eventually be removed completely. Good news is the .on() method, which replaces it, takes the same arguments.