I've had this issue where suddenly every save file image was pure white, as well as the maps available. When you tried to play them it would load most of the way then crash. I started removing the downloads, thinking it must have been a broken download, but at some point of adding them back, I noticed that when a certain number of downloads was reached, whenever I bring in any file the issues would return. I doubt all of my remaining eight-ish files were corrupted, so I wonder if there is a limit I'm hitting?
Currently standing at around 499 downloads, whenever adding another one, the bug arrises.