Received Snapchat photos appear black?

[chodome]

For just a few of my friends, snapchat pictures appear black, but video is fine. When I use a snapchat saver to view them, I can see the pics. I just want to be able to see their pictures without taking a long time to open the snapchat saving app every time. Most friends have no problem, but its just a few that cant send me normal snaps. anyone have a solution? also im pretty sure they all have iphones so its not like a problem from a specific phone i think