I had the same problems:
http://forum.getkirby.com/t/can-not-login-with-google-chrome/1214
Turning off the Varnish Cache was the solution for me.
I had the same problems:
http://forum.getkirby.com/t/can-not-login-with-google-chrome/1214
Turning off the Varnish Cache was the solution for me.