I have the white box issue on my iPad 4th Gen and iPad Air 2 as mentioned in other reviews, and its quite annoying. However, the white box is not actually empty, folks: the share/save buttons are still there, they are just also plain white. Tap in the box and you will see... Its just tough to guess where the correct button you are looking for is within the white square... but they do work! Still, this issue needs to be fixed!
Galloway17 about Astronomy Picture of the Day, v3.3