Looks like Brad fixed it? I was testing for http://community.livejournal.com/lj_support/623509.html
Right now, if you're on some Unicode-enabled system (erm, Safari is good), and you don't see anything between the dots above? Copy and paste that to where URLs should go, then hit enter. Or move through it with the arrow keys. You'll notice (at least on Safari) that there's an extra character between the dots. This caused livejournal to return a "bad unicode" error when you tried to post something like it.
I don't know if the bug still exists, or if it's been patched (unlikely?) or maybe I'm just not getting it right and triggering it correctly. Phoo.