I installed the author image plugin and discovered it did not meet my needs -- at least not without code modifications. (The avatar for the author for which I tried to use the plugin showed up blank.)
So I deactivated it and uninstalled it.
However, the author still shows up blank, even though I have avatars enabled and am using the "Identicon" as a default image.
I checked the page source (preview), and the avatar-related section looks the same as for authors for whom the avatars do show up.
I checked the database tables for users, and this user looks the same as all others.
I want to know what I can do to restore normal function for this user -- i.e. how I can get the normal avatars/gravatars to show up.
What could the plugin have changed that is creating this problem?
(Yes, I have flushed my browser cache, used different browsers, etc.)