So it turns out that I'm really invisible after all. Ah, sweet irony.
Update 6:17 PM: I am an idiot. Turns out I screwed things up by backdating all my entries (which happened before Arisia). I just fixed the problem, and comments have started flowing in at the usual rate. So the entire issue was due to my own incredible stupidity.
For the record:
I was stupid...I was stupid...I was stupid. You may mock me, if you wish.