There's currently not a way to go back to the old avatar system though it is possible to upload your own avatar art. We're actually using the three layers for background, person, and accessory (e.g. dog) rather than the default layout (here's a sample avatar for our program).
The avatar-title text should be replaced with the text that was added to the program resource text in steps 16 and 17 of the upgrade process. The site might require a restart (the App Pool just needs to cycle) to reload that text - it should happen automatically after a certain amount of time or you can edit the Web.config file and save it to force IIS to restart the App Pool.
Sorry about that with the Avatars, I may not have made it clear enough that the system was going to change. Let me know if there's anything we can do to help.
PS: I think if you remove all the avatar art via the Control Room and upload your art all in one layer (like layer 0) then the other buttons will just be disabled and they'll cycle with the enabled buttons. That might solve the problem for now (though look a little wonky with the non-functional arrow buttons). I might be able to provide some edits so that you can hide the arrows that you aren't using.