The above procedure started to work again on my RasPi2 with v1.1.7-RC2.
It even survived the automatic update from an earlier internal test build I ran.
Just don’t get impatient when you run ln -sf /usr/share/zoneinfo/America/Chicago /var/run/localtime for the first time in ssh.
It takes ~20 seconds until the change is reflected in the PMP GUI.