I'm wondering if there was an outside test group at all. That issue seems to have persisted to the demo, which isn't encouraging. I know Brad personally has limited hardware on which to check things, but one would think that there'd be a QA/QC department that would actually do the testing.
I had been invited to be part of some of the previous Civ beta cycles, but didn't see a thing anywhere about such a program for Civ 4. NDA usually keep most people from blabbing, but they rarely keep everyone from even acknowledging that there's a testing group.