WordPress Infinite 302 Redirect loop on login after Reverting or Overwriting Folders
A few weeks ago, I updated a WordPress installation to 4.0, only to find out that the theme it was using, was not yet fully compatible with 4.0. So in order to revert to a prior version of WordPress, I had to download the version I wanted, and remove and re-upload only the wp-admin and wp-includes directories. [...]