Avatars not showing in pages

I have a problem with comment avatars.
I have avatars turned on in my site discussions panel, choosing gravatars or gravatar symbol. Comments are linking and in dashboard the avatars show up from the back end. However in the actual page I am just getting a blank box. Take a look at this page https://www.bigbikesforburma.org/2011/10/18/rob-kilpatrick/
I have tried reloading wordpress. I have tried to delete all plugins getting in the way, still nothing. I have turned off avatars and then on again. I would like to remove these boxes all together or put some sort of holder avatar in there. Any thoughts as to the problem?