Greetings,
I have a PI 3B, together with a 7" screen running Stretch (in a default configuration); for months everything ran fine until suddenly the desktop panel was moved downwards and to the right for +/- 100 pixels; I managed to correct the problem by using a 'Panel Settings' dialog; I popped it up by clicking on the vacant area; but something more serious had happened: the real screen was completely blanked (the bnc server stll ran fine); it does work though because when the PI reboots I can see the coloured rectangle but the screen is blanked before I can see the four raspberries and the boot messages.
I have no idea what had happened ... any idea anyone? (and more important, how to cure this?)
kind regards,
Jos