I've noticed that when I'm posting comments on a WordPress blog while using Internet Explorer, there seems to be an issue with the first comment: the instant I enter the first character, the text box resizes itself and juts under the sidebar, obscuring the text as it is being typed. This behavior does not manifest itself with Firefox or Mozilla, nor does it show up in IE in any comment after the first.
It seems to be at least partially theme related - it happens with the 'classic' theme for instance, but not others. (It is also happening here, in the forum, with this post.)
IE bug? WP bug? Both?