I am able to log in to PyPi no problems. However, when I attempt to register my package using the web form, I am prompted again to authenticate, and my credentials aren't accepted and I'm unable to proceed.
When I try "python setup.py register" from the command-line to do the same thing, I am similarly unable to register the package.
The only potentially non-standard thing I can see that I have done is my initial user registration was performed using Oauth rather than username/password. However, I then later explicitly set a password and can log in with a username/password combo.
I'd be happy to just have my user account totally blown away so I can re-register and try again, however if that doesn't fix things then maybe there are bigger problems.