On one website in WP 3.6.1 version, when I want updating theme appearance with theme editor, I am systematically redirected to login page without logged out.
I didn't undestand why. It did this only if I chose style.css not functions.php for example.
I decided to install on the same hosting a new 3.7.1 version and I had the same result with the default twenty thirteen theme.
This website on localhost installation works fine !
I have some others websites which work fine too with the same version on same hosting.
From what could it come ?
Any help would be appreciated