This is my solution for the problem with User Avatar.
I did NOT uninstall User Avatar and I DID install Simple User Avatar.
They are not conflicting with each other on my site, because they take up different “places” on the users’ profiles.
On profiles that have their avatar set by User Avatar, nothing has changed.
On profiles that I’ve added since the plugin stopped performing properly, I’ve used Simple User Avatar.
Interestingly, it looks like SUA hasn’t worked once I use it, but when I go to the user’s profile where I’ve applied it, the avatar I chose is there and not the default avatar, so it actually does work even though it doesn’t look like it from the backend.
Eventually, I’ll switch them all to SUA, but right now I don’t have time to do it manually for all the ones that need switching. Once I get them all switched, I’ll delete UA.
For now, SUA and UA are playing nicely in their own areas, so this may work for others who don’t have the time to delete the old plugin, install the new plugin and then go through manually and update each user who hasn’t figured out how to use Gravatar.com.