Possible Duplicate:
Why isn't my Gravatar image updating?

I changed my Gravatar image 24 hours ago, and it still does not appear on the Stack Overflow sites.

I check it at http://en.gravatar.com/site/check which confirms that it should have already been changed on sites which use it.

Do I need to flip a switch somewhere on my profile or something to get it to refresh from Gravatar?

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