Similar issue,
nvidia 550ti - gnome ubuntu 14.04 also mint 17
setting tv to off and main monitor on - no change to position on saving in either nvidia-settings or display results in both turned on after reboot.
this worked fine previously on mint 16 or ubuntu gnome 13.10
Plus setting importance to low is not very helpful to those who have the issue, I bet if it affected a developer it would be much higher importance, every bug is important to those it affects!
Similar issue,
nvidia 550ti - gnome ubuntu 14.04 also mint 17
setting tv to off and main monitor on - no change to position on saving in either nvidia-settings or display results in both turned on after reboot.
this worked fine previously on mint 16 or ubuntu gnome 13.10
Plus setting importance to low is not very helpful to those who have the issue, I bet if it affected a developer it would be much higher importance, every bug is important to those it affects!