WordPress Spell Check: Does This Thing Work At All?

I find myself a bit baffled by WordPress 2.1 at the moment. The spell check functionality doesn’t work at all for me. Look at the spelling of the word defaults below – “defults” – and the spell checker says there’s no problem. I don’t think this is an instance of Canadian vs. American spelling either. 😉 I did a bit of searching but can’t find anything about how/why the WordPress spell check feature would not work. Anyone have any ideas?