Manhag,
Dreadfully sorry, been busy irl. Now, if we both have patience, we'll see this one through. I'm sending you the relevant files from my code. Place them in one directory, create another directory next to it and put your files in that one. Then, use
winmerge to compare each of the four files. My code has many modifications--look only at the ones that contain "message," "$message," "POST" or "REQUEST," and in post.php, the "INSERT" into the database. We need to figure out where the chain is broken. Begin by comparing my fb_bb.js.php to yours. It seems like the problem is somewhere there. Good luck and keep me posted!
Cheers,
Gom
P. S. If we manage to get this working, I have a bonus for you

. It's a cleaned up version of the iBrowser plugin that lets users upload pics from their hard drive into their post. Check it out on Gossper--the icon is right next to the smileys.