Beat - Ive noticed a couple of things from the debug.
Under the master script (edit the master script)... the Defined ad block has nothing for its banner count. That needs to be at least 1 or no images will get pulled.
Some of your banners are in inactive categories which means they wont appear in the Display page. (They just kind of disapear is the category is blank)
Finally, in your navbar template, you appear to have $GAB_ads[2] and $GAB_ads[5]... but no $GAB_ads[0] and up
The first ad output is always $GAB_ads[0], the next $GAB_ads[1], etc...
HTH's