i think this Version has conflicts with the latest jQuery (1.7.1 "http://code.jquery.com/jquery-latest.js").
There are some DOM loading problems, i guess. Depending on the order i put the jQuery source link in the <head> cufon gets problems. Most likely at the end of the <head>. With earlier jQuery versions (now im using 1.4) that problems don't accure.
I guess you should investigate that. :)
Thank you and best regards