weird internet explorer problem — for developpers and php gurus

I’ve a weird problem:

https://dev.semiologic.com/ works in Firefox, and in IE

https://www.semiologic.com/ works in Firefox, but not in IE

same code, same theme, same database — different tables, but i see no reason this should wreck the site.

IE prompts me to download the html file that results from the php, as if a text/html header declaration was missing or false somewhere. The same goes for the kubrick theme, so I presume it comes from wordpress.

i’ve downloaded the latest version of 1.5 and it still doesn’t work.

i’ve checked for viruses and IE updates… no success…

https://www.semiologic.com/feed/ sprouts a perfectly normal feed in IE, so I’d rule the server out.

remains wordpress. anyone else experiencing similar problems?