Hi Ron, thanks for the suggestion - in this case, since I don't use a screensaver, there must be something else. :) Yuuri Quoting from message Sat, 12 Jan 2019 17:34:53 -0800: > Not sure if this might be related. >I think I installed xscreensaver-gl and >think if you have it installed it could >be Preferences-Screensaver