I've set my browser (Firebird 0.7) to clear cookies with every session. Now, when I look at any posts or click "Mark all as read", it may not immediately show as read; but if I log off, and then return with a new session, all the posts are correctly marked.
How did it work on the old system? Were cookies more efficiently updated, or what? (Not that I have a sweet clue how any of this works.)