Ok, I have a REALLY strange problem with my weblog (http://tinyurl.com/2ars95l)
When you click on the commentform in IE (all versions) the commentform and comments disappear from the page!
I disabled all the plugins but that doesn't make a difference. When you reload the page the form and comments won't disappear. FF and other browsers seems to work.
I think it has something to do with the CSS.