I\'m developing a website using the Seam framework and the RichFaces AJAX library (these isn\'t really all that important to the problem at hand - just some background).
I've since discovered the reason (a while ago actually). It turns out that IE semi-validates (it'll balk at some errors but ignore others) inserted HTML. It was throwing some 'unknown error' or something similar which was pretty much completely useless since it gave no indication as to what went wrong - just that something went wrong.
In my case, it was because an
was being inserted with a parent . If you're having similar issues, you may want to make sure you're not trying to be too clever with your HTML.