With the End key I can scroll to the next page of a score, with the Home key to the previous page. If I reach the last page with the End key then it is not possible to use the Home key to go to the previous page. Is this a problem with my german keyboard?
No, I doubt it’s a problem with the German keyboard, but more that once the final page crosses a certain point on the screen, the Home key won’t move it back again. In other words, it’s a little bug.