[pcglue]

But when I delete the last bookmark for a given tag, I still see the tag in the tag editor, even after a page refresh. And I can still click on the tag which brings up 0 bookmarks. Does it just take a while to be removed?

[pcglue]

OK, never mind, it just takes a while for it to be deleted (around 10-15 seconds). I've just been impatient.

[idlewords]

Yeah, it's done by a background script. But genuine orphan tags should not be possible.