The most recent build of x2go corrected the xrandr version issue so it is no longer necessary to resize your screen with xrandr, it will size automatically or manually via the normal menus.

     There is however a strange bug in the new version that causes it to wedge occasionally.  A session will be disconnected and when you try to reconnect you will see this:

     If you get this please notify support@eskimo.com or call 206-812-0051 as the server will remain wedged until we take manual action.  I have reported this to the developers of x2go.