Originally Posted by cshadow
It's the file ~/.config/monitors.xml and it can be changed via the gnome-display-properties. Which is BTW completely useless if you are using nvidia proprietary driver. My home folder is quite old and it seems to be some remnant from the past :-)
Thanks Rudd-O and the rest of you to point me the right way.
Thanks very much!!!!! I couldn't change my resolution and get it to stick between reboots.
removing the above file fixed it!!!!