I just fought that last night for a couple hours. I even did a complete uninstall and reinstall. My "assign terminal" dialog wasn't showing up. I was using multiple monitors but set the Surface Book screen "off" and used the 24" monitor as "Second Screen Only". I had to adjust the screen setup and low and behold the dialog was on the Surface Book Screen- which was turned off by the OS! Sure wish SE would handle the dialog boxes better.