This plugin works fine on one of my blogs (3.5.1), but doesn't work on my other one (also 3.5.1 but different theme).
Behavior is strange. It seems like the code is there, but it doesn't work as expected.
Here is the page in question: http://prettygirlsblog.net/2013/02/13/amber-heard-in-quotdrive-angryquot/
Thanks a lot for the great plugin, donating soon :)