Regarding errors, in the...
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Error handling and logging ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
...section, you should have the following line uncommented:
error_reporting = E_ALL & ~E_NOTICE.
That should sort out any problems you're having with unwanted notices (i.e. PHP whingeing about uninitialised variables). Then, once you've done that, go to the section titled...
;;;;;;;;;;;;;;;;;
; Data Handling ;
;;;;;;;;;;;;;;;;;
...you should have a line saying:
register_globals = On
I believe that the default setting is 'register_globals=Off,' which is a more secure way of doing things (and one where you have to prefix variables). The INI file contains more information on the subject.
Hope this helps!