Tagging profiles with Taxonomy Fields?

Can taxonomy fields be used to tag users like you can with the core profile module?

I love the way you can use a phrase like "People who live in %" using the regular Drupal profile module and then by clicking the link, get a list of all users who live in %. I'm trying to get the same thing happening with profiles as nodes. I've tried using Taxonomy Fields in both the Node Profiles and the Bio Modules. It almost works, but only intermittantly. When clicking on a taxonomy term/link/tag, Sometimes I get the message "There are currently no posts in this category ..." other times, some users will show up and others won't - even when they have been tagged with the the term. And then surprisingly, sometimes it just works!

It usually works perfectly if I initially create a user bio/profile with single every term in the vocabulary checked. Then when I check a few terms in another users bio/profile, it works! But if I commit the sin of clicking a term before at least 2 users are tagged with it, the link shows no posts. From there on eveything goes downhill and I can't get to the link to show any posts even after adding the tag to another user. Also, if I add a new term to the vocabulary, it will not take.

Is there some kiind of trick to using taxonomy fields for tagging? I'm not understanding the logic of how it works. What am I doing wrong?