I may have found a work around. After rebuilding the style picker 5 times, I still have no drums. In the AU plugin, I right click on the N/A drums, which brings up the drum picker box, which would enable me to choose a different drum style. I rebuild the drum picker - still no drums. Then I look at the drum list over on the right side (drum variations of the same basic beat) and choose the variation that is showing N/A in the plugin. Now I have drums! I also have a headache from spending a half hour getting BIB to work the way it's supposed to.

This is an obvious bug. Why don't they publish these workarounds in their FAQ page, or here somewhere? All I got from tech support, after waiting a week, was "rebuild the style picker" even though I'd explained that I'd already done that multiple times. They also told me I didn't own the Ultra Pak, even though I bought it directly from BIB and it's on my 'product' page. Seems like they do everything in their power to alienate customers.