FYI, as reported on x2go-user, the upgrade resolved Robert's issue:
On Mon, Sep 19, 2016 at 1:50 AM, Robert Dinse <nanook@eskimo.com> wrote:
It mostly worked. With x2goserver installed I can connect now with my
x2goclient and screen resizes properly. Also in Mate, System->Preferences->Hardware->Displays now works.