[Catalog-sig] Can't upload to PyPI

[MRAB]

Since the PyPI security notice of 2013-02-15 I've been unable to upload
to PyPI via "setup.py upload".

I changed my password during the grace period, and have reset it, but
it's still rejected:

Upload failed (401): Incorrect password

I can login to PyPI with the password, but even though I've changed the
password in ".pypirc", it still fails.

Can anyone suggest what could be wrong?