I'm having the same problem. But it's not every pic (I think it might just be from Iphones) I've had three different reactions when receiving pics.
1. It works (most)
2. The pic is just black
3. an error message reading :
<Subject: no subject>
_________________
The image file IMG_3020.JPG is not supported and was deleted.
I've only had this error message a few times in the last two weeks. No idea what it is or how to fix it.