Photo problem

Hello,
When I open the photo application, I see little icon (right top corner) and last photo (left down corner) but the screen is black.
I have this problem in march and this problem solve by himself.
But now, it 's 5 days and no resolution.
It's only the photo of the back : the another photo (on the face ) is ok.
I think it was a problem of synchrinisation of pictures, but I put off all sync (I think all) and no change.

What may I do ?
Thank you.

(sorry for my poor english)