[chrishajer]

I confirmed on a 0.9.0.3 installation that this is the case. I had a topic with a tag, clicked “topics with no tags”, the topic does not show up (others do.) I deleted the tag on that topic, topic still does not show when I click “topic with no tags.” I went into the admin for the Recount, and even after recounting everything, the topic still does not show up in the view “topics with no tags.”

I upgraded the installation to 0.9.0.4 and the problem persists. I didn’t look into why it does not work as expected, but this is not what I would have expected either. (It’s like the topic is marked as having a tag, but it’s never set to “no tags” after the sole tag is removed.)

You might want to file a bug at https://trac.bbpress.org/