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?