One day I powered up and suddenly the resolution for my monitor was set at 1024X768 which is a much lower resolution than I was using......
Can you pin it down a little more accurately than 'one day'?
Has there been any glitches in recent downloads?
None that I have read about that cause this sort of problem, but maybe you are the first to report them?
If it is an update that caused this then you need to be a bit more precise. Both the package manager and the update manager have a 'history' section. In the 'view' menu in update manager and in the 'file' menu in package manager.
Have a look through those and see if any graphic related program was updated just before 'one day'. That might give you, or the forum members a better clue as to what has caused this problem.
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).