I used to have a nice picture of myself and now it's gone.
Here on the Meta Stack Overflow, my avatar picture is still the same, but on Stack Overflow, it's gone (replaced by a generic blue wavey square).
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The gravatar hashes are different (
a3b6a0105b9fad65b692ab203bffaaeb on SO), so you must have a different e-mail address in your SO profile. The e-mail has to be one that's registered with your gravatar account for your chosen gravatar to appear. Once you have your profile setup on one site, you can clone it to all the others with the "Copy Profile To Related Accounts" button on your accounts tab