I have been using OpenID authentication in Drupal 7 for quite a while, using an myopenid.com identity. Now, since myopenid.com has announced that they are going away, I want to add a new OpenID identity to my account.
However, I am not able to add another identity. When I try to add another identity, the browser starts loading a page, but then stops loading. I am not taken to the provider's login page, whether or not I am logged in to the provider's site. (I am already logged in to my Drupal 7 site -- I am adding the new ID from my profile's OpenID Identities tab.)
When I manually go back to that OpenID Identities tab, the myopenid.com identity is there, but the new one is not.
There is nothing in the Apache error log or access log suggesting what is going on.
Any idea how to debug what is going wrong?