I've checked the forums for a similar problem but haven't seen anything that seems to fit.
As of perhaps a week and a half ago, my site seems to have stopped "pulling" the associated Gravatar image for myself (admin) and all other users. I have not added any new plugins during this time though there have been updates to several. However, none updated have anything directly to do with user profiles. The only user plugin installed is Capability Manager. Also, the Gravatars are working in comments but not showing up on the back-end User list/settings, nor in the author locations.
I'm wondering if anyone has had a similar problem or might be able to guide me in discovering or fixing the issue. Thanks!