I fixed it as far as if the error was as Rick said and being related to the fact that the variable is undefined so that's why you don't see the error statements. Would it be possible for me to access your account so I could do a few tests. I would like to see what's being passed to the script, if anything, when the post is made.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.