I've just set up MT 4.0 on my football team's website. The domain name unfortunately uses the norwegian character 'æ' (HTML: aelig;). Fortunately it seems like almost everything is working - except logging in/out on the comments page. You get to the log-in-page and type in user/pass, but when you hit the 'sign-in'-button, Firefox tells you "Not a valid address" and no page is shown. You still get logged in though - that is if you just open the comments-page again. The same problem pops up when you try to log out via the comments-page. The log-in to the blog-administration works just fine.

I suspect that this has something to do with MT not supporting IDN. Any solution out there?

(The site is http://www.guttæne.no/)

Thanks.

Fixed it!

Just had to redefine 'Default site URL' on the administration-pages from http://www.guttæne.no to http://www.xn--guttne-sua.no