It shouldn't be an issue of your PHP or MySQL version, as I am running
PHP 4.2.3 and
mySQL 3.23.54 and it works fine.
I have heard of issues with this on
vBulletin 2.2.9, which is what you are running, so there could be some conflicts there. I do not have 2.2.9 installed, except on my localhost, so I will install this hack there and get back to you a.s.a.p
Thanks for contacting me via PM also ptm, as it's the best way for those needing help with one of my hacks to get my attention, in addition to replying to the thread.