Why is my Gravatar blank at GitHub's Pulse view?

Question

On every Pulse page on GitHub, a default Gravatar is shown instead of my usual one:

I'm using two email accounts on GitHub, one for logging in, and another one for blaming. Both accounts are correctly set up to my GitHub page and at Gravatar.com; my Gravatar is clearly visible in all issues and commits, but not at the Pulse page (for the record, the hash of the image is d41d8cd98f00b204e9800998ecf8427e, an empty string).

How can I get my Gravatar to show up, instead of a blank one?

Answer 1

I filled a contact form at https://help.github.com/contact, and got the following reply within a few days:

Hey Rob

Sorry for the delay getting back to you. We pushed out a fix for this a few hours ago. You should be showing up correctly in Pulse pages now. Let me know if you're still having any trouble.

Cheers
Brian

Indeed, the issue has been resolved for me. As a bonus, my Gravatar also shows up before the box of commits that used to be blank for me as well. Example:

Before

After