Yes, I will still have a delve around.. Seems to be common like you say.. Windowed mode is fine full screen. If I do cure it i'll let you know. Thanks for the sugestions. 
On updating to the latest kernel 4.1.0 it seems to have stopped resetting my nvidia settings.. However I do now get screen tearing in vlc player. But a quick reboot cures the problem.
On updating to the latest kernel 4.1.0 it seems to have stopped resetting my nvidia settings.. However I do now get screen tearing in vlc player. But a quick reboot cures the problem.