Hello there and happy New Year!!! I have a device running Windows 7 embedded standard. Primary monitor (1) resolution and orientation is locked and can not be saved no matter if you choose to keep settings and save. It reverts back in a few seconds. How ever i can manipulate the monitor 2 any way i like. Any ideas were to dig?
More aboutdisplay resolution lock
I would probably start with updating your graphics card's driver if anything.