Problem: some pictures in Photo Album display as blank; some show fine; all Synced

[JohnMemphis]

I recently Synced a lot of pictures to my original iPad, using several folders in Windows Explorer, which translated perfectly into Photo Albums. The problem now is that some of the pictures in some of the albums show up fine in the thumbnails at the bottom of the display pane, but the picture itself shows as blank/black.

Can anyone help with what might be causing this problem and how to fix it?​