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can you give me a link on your site where any of those gravatars in that test topic are displaying correctly since you said they show up in wp fine???

well, I cannot explain what is going on... both the WP avatar and the SP avatar are sending the exact same url for the gravatar... The difference is the WP code is simply outputting the url as the image... we cannot do that because of the priority scheme and must see if the gravatar is valid first... If I just enter the verification gravatar url directly in the browser it returns the expected answer... however, if I use the wp functions for this or any standard php code for checking the headers, the return answer is an error condition...

so something on your server is blocking the headers check... are you running mod_security? or any other purported security plugin or mechanisms (such as bad behavior)??

might be time to talk with your host and find out why:

$headers = wp_get_http_headers($url);

generates an empty response on your server... of course, url is the url of your gravatar... but something is blocking or messing with those header checks... and we know it works because tens of thousands of folks are using gravatars fine...