We had this very strange Cufón problem in IE, due to which we were unable to address. I think this has something to do with text that is hidden and muted.
The problem is that both cuffon and plain text are displayed (and I noticed that the tag that Cufón normally uses is replaced with <: cufon>). In any case, this happens in the native IE8 (not in IE8 IE9 mode).
The jsfiddle value is worth more than a thousand words: http://jsfiddle.net/Osoascam/vqnh3/1/ To test, click on the red circle so that the text moves to the left 4 times (for some strange reason, this only works on FF and IE, but it reproduces the IE8 error, so I can live with it).
Any help would be greatly appreciated. Here is a screenshot:

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