I'm posting here to see if anyone else had this problem and found a solution. My org page background image used to display correctly, until I attempted to change it a few weeks ago. A 1366x768 image will not display properly no matter what I do. I even tried re-inserting the original image, which worked before, to no avail. At this time, it seems to only occur when you try to change the current background image. Anyone else have this problem? See before and after below: