May be that it is the cause. Now I found out that it works when I use the Fullscreen button in the on screen menu and not the F11 key for fullscreen mode. After that I can spread the image over all screens with the F12 key. Thank you for your answer. I will try it if .
Hello, since a while F12 doesnt span the image over my 3 monitors in full screen mode . Normally I used F11 at first for full screen mode and then F12 to span over all monitors. Now the image flickers a very short time on the left monitor (about 0,1 sec.) The image on the middle monitor remains in its size and position. I switched also of my multiple screen software UltraMon with no success. When I use the windowed mode of JPEGview it spans the images above all monitors. Months ago I used also Display...