this is a known issue with IE. as far as i know, there is no fix. my old site uses movable type, and on that site i simply defined tables in the index file. this worked well. i’m not sure if that will work with wordpress or not… i’m about one hour into the software myself and still have a lot to do to get everything moved over to the new site and working.
here’s hoping there’s a css fix, but if it can be done with tables in WP (i honestly don’t know if it can) then that seems to work well too.