Moshu, where are you seeing that strange line you mention? I'm asking because I am also using wp 2.2x and getting very odd linking behavior in Internet Explorer browsers for this:
where clicking some of the links (typically, the ones without posts) on the left size (first try birth injury, which works just fine in IE, then try degloving injury, which doesn't)
I'm using /%postname%/ as the permalink structure (which has always worked fine for me in all versions and on lots of host companies and for all browsers).
1) some of the links will return a 404
2) if you use the back button, then click the same link, it will likely show you the page...
3) this only happens in IE 6 & 7
No front page extensions installed on a linux acct at godaddy.com
I'm pulling my hair out at this point. ANYONE out there with ideas? Moshu, if you can tell me where you saw this other person's odd line, I'll look for that in my pages.