My wife and I just purchased Nokia 928's 6 days ago and yesterday I noticed this green screen problem when trying to take a picture. Glad I found this site, I figured I would have to return the phone, although I'm still considering it as it's ridiculous they haven't found a solution to this. On the other hand, I absolutely love this phone and would just get another 928 which would probably have the same problem at some point in the future. Maybe Windows Phone 8.1 will fix the software issue?
*I'm assuming it's a software issue and not a hardware issue.