This site is throwing back a lot of errors (277) in just HTML validation. Something I thought you should know, take a look at the following link:
http://validator.w3.org/check?uri=ht...group=0#result
That wouldn't affect internet explorer blocking it, but it may affect your SEO a bit. As far as I can see, theres nothing stopping it. I suppose it could just be something strange happening now and again. No other complaints so It might just be me...
Regards
Lewis