I'm using 7.84. I -think- I was using 7.83 before I re-installed it, but it might have been 7.84.
vB version is 4.1.11. (Was on 4.1.10, but when we moved stuff to subdomains, there was a bug for going to the first unread post of a thread, and that was fixed in 4.1.11, so we just upgraded last night.)
I have the site on three subdomains, basically. Normal content (including CMS) is on the plain old
www.domain, forums are on
forums.domain, and blogs (not that it matters) are on
blogs.domain.
What I "moved," well, it wasn't really a move. I left everything installed as normal. I then created a
new file in my forums sub-directory on the server called
post_thanks.php (originally, there was just the one on the main part of the site). I put into it the content you see above (which is the content in most files in stub directories like mine).
I will install this onto my clean testing forum tonight (I split it into sub-domains as well not too long ago), and see if the problem persists.