I guess if you're not going to take the time to figure this out yourself, I will point you to a working copy of the template and program files here
. I had assumed that you already had copies, since you said you installed it, but you must not.
At this point, I can not guess what you have changed to make this not work. The code in 2.0.18, as distributed, works. You need to compare it to what you have on your site in order to figure out why yours doesn't. I've run out of common causes to point you to... we're left with something having been modified by someone
to break this portion of the program, both from the administrative and registration aspects. It is rather hard to believe that both
sections could be "accidentally" broken.
The UltraEdit editor
, which offers a 30 or 45 day free trial, comes with a utility called "UltraCompare", which is quite good at displaying the differences between two files - I use it often for comparing different releases, to verify that changes are made properly.