Tags field disappeared

So, you know how when you click on “create new post,” directly below the post body, there’s a field for tags? Yeah, that field has just disappeared, for no reason that I can fathom. The only recent change I made was an upgrade of the Askimet plugin, but the “tags” field disappeared several hours after I upgraded Askimet, so I’m disinclined to think that’s the cause.

What in the heck is going on?!