Brandon, I think you're right; I'm not sure what decided the .Xauthority files needed to move to somewhere else, but there it is, no longer in your home directory.
Try adding the following line to your /etc/apparmor.d/abstractions/X file:
owner /run/user/*/gdm/Xauthority r,
Then sudo apparmor_parser --replace /etc/apparmor.d/
Brandon, I think you're right; I'm not sure what decided the .Xauthority files needed to move to somewhere else, but there it is, no longer in your home directory.
Try adding the following line to your /etc/apparmor. d/abstractions/ X file:
owner /run/user/ */gdm/Xauthorit y r,
Then sudo apparmor_parser --replace /etc/apparmor.d/
Thanks