I clicked the gear icon next to the privilege tracker in my profile (if it matters, it was in the elementaryOS beta SE) and picked the "Track a tag badge instead" option in the menu, to see what it looked like. Unfortunately, it seems there's nothing to track, since I see no progress meter below the reputation graph now. As a consequence, I also don't get a gear icon to change that preference back!
I should either be unable to pick the tag badge option if it doesn't apply to my account, or I should have a way to restore the prior setting.
ps - Although I'd like to see this fixed for everyone, any help is appreciated for immediate workarounds as well.