I re-installed my antergos sytem today (gnome setup) and I did as usual when I reinstall my system, I kept my home partition (and mounted it as the /home for the newly installed system). I never had problems before.
Before install, I renamed the .config and .local folders.
This time, after the installation, I was unable to login into a session. I finally discovered the reason for this. I noticed the the subfolders into the newly created .config folder were owned by root, instead of user.
So I did
sudo chown -R nous:users .config
and everything was solved. I wanted to report this, if it can help .