I think this has to do with server config and using the search engine friendly URLs. It should resolve itself if you turn the search engine friendly URLs off.
Or to try and make it work try this - backup your files first. <img src="https://www.ubbcentral.com/boards/images/graemlins/wink.gif" alt="" />
In ubbt.inc.php try changing the 5 occurances of "PHP_SELF" to "SCRIPT_NAME" and see if that has any effect as the only table gets updated with new entries.
