same problem here – images users with gravatar icons load ok, images of users who have no gravatar show a broken link.
working (gravatar) links are of this type:
``
non-working (non-gravatar) links are of this format:
``
Presumably all avatar functionality is piped through Gravatar and images are shown as arguments in a gravatar.com command – this command fails to work though when there is no gravatar available…
any ideas why this is happening and how to solve it?