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Yeah, I know.

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Hmm... It seems the problem is with Firefox on that particular PC. I've tried it with the same version/settings of Firefox on other systems and I was not able to replay the problem. I guess we should leave it at that. Anyway, a bit more info in case somebody else shows up with the same observations:

Firefox/1.5.0.1 on WinXP SP2, Internet Connection Firewall disabled. I visit the homepage of this site, then follow a link to a topic like this:
http://www.peak.ne.jp/xoops/md/xhnewbb/viewtopic.php?topic_id=1250&post_id=4614#forumpost4614

When I try to login with the problematic system I get redirected to:

http://www.peak.ne.jp/xoops/md/xhnewbb/viewtopic.php?topic_id=1250&post_id=4614

and I'm not logged in. After browsing a bit I see the 'Thank you forr logging in' message and I'm logged in. Notice that to the the above url I don't receive a PHPSESSID appended. It happens with only that particular system. On all others I've tested, I do receive a PHPSESSID appended to the url.