Okay - it appears there is some sort of authentication issue happening with PPO this AM.
However, it isn't stopping us from enjoying our favorite website.
Whenever the Windows Password box appears - just click CANCEL.
Don't enter your password or userid or anything - CANCEL it.
Then proceed as normal.
It's a pain-in-the-woo, for sure, but it's better than the site being down.
I'm sure Webby will be fixing it shortly.