I had some trouble with the cufon fonts on the Coffee Junkie theme by www.ilove2design.at.  When opening a lightbox they would appear the first time but not again until i refreshed the page.

The solution:
Open the “jquery.simplemodal.js” file in the js folder and add this line at the very end of the file.

Cufon.replace("h2");Cufon.now();

This will refresh the cufon fonts after they’ve been disturbed by opening the jquery lightbox. I hope this saves someone a little time.