Page jumps to the left of screen
The problem is that suddenly the score moves to the left and part of it is hidden by the palettes. I have to drag it back again and find my original place. This problem can occur when I click on a rest to put on a note or if I happen to use the space bar. In fact, I can spasmodically lose my place at any time. It was especially bad after I installed the plugin "Courtesy Accidentals" so I removed it. The occurrence was lesser but still it did not stop the problem altogether. I am left with this huge black section on the right of my screen, which serves no purpose; and you can image how time-consuming it is to drag the score back into place each time when required.