No problem at all.
I am using Firefox 3.5.3, so have a look in that and you will see the problems. I have only checked in this browser, but I would recommend looking in all browsers aswell, incase there are any other problems.
I have used cufon many times, its easier than it looks to be honest, I follow this amazing screencast over here at: http://net.tutsplus.com/videos/screenca … -you-wish/
Hope this helps