Re GLBT threads .. a *suggestion* that might work is to post something new on the thread or edit your existing post in some minor way. I *think* then the new post reflects your current signature?
Re original problem ... were you posting before at any place with a lot of FT'ers?
At Bernie's apartment in DUS last month I started this thread and many others posted on it over a beer.
http://www.flyertalk.com/forum/Forum32/HTML/003047.html
One FT'er tried to get her sign-in cookie deleted. Several folks worked on this and it simply would not disappear. So Bernie can now post for many FT'ers.
(The year before it was over a dozen cookies stayed stored, but then he upgraded his computer.

)