Toontown support may be able to offer some better advice here than we can; but I can offer some suggestions.
First, I wouldn’t worry too much about the “newer version” problem. It’s just telling you that you don’t need to install another copy of the Panda plugin, since you’ve already got one installed. If you really do want to uninstall the previous one, and force an installation from scratch, I think you can do it with the command:
sudo pkgutil --forget org.panda3d.pkg.runtimeBut I really doubt that the version of the Panda plugin is related to your installation problem.
The actual content of the game is downloaded into ~/Library/Caches/Panda3D. If you delete this folder, it will force a clean download of the Toontown game, which should be much better behaved.
Still, I’m curious about the endless loop you were getting. That does sound like a potential bug in Panda3D. Can you tell me more about it?
Thanks,
David