Ok, it's taken me a few weeks to nail this down...Currently, I have a root site https://sp.mydomain.com and the people-picker works fine there, however, when I try to add someone on a subsite (e.g. https://sp.mydomain.com/sites/othersite, that subsite only reports the 4 people that were originally on it...
How can I get the people-picker for that site to match the people-picker for my main site?
Just to let you know, there are no special stsadm commands specified for the site that I am having problems with.