Last week, Wednesday to be specific, I noticed people not hosted on WordPress.com started having problems commenting. They are getting kicked off and being told to register with WordPress. A friend of mine went ahead and registered, and then it wouldn't recognize her password. She requested a new one. Not even WordPress' password that they just gave her today will recognize her. Any idea why this is happening on some blogs and not others? It's not happening on mine, but does seem to be happening to a lot of people on WordPress.com blogs.
For troubleshooting, they've tried using their Twitter account and Facebook account on the comment page and still get kicked off.