I have a white iPhone 4, recently bought an Otterbox defender case. I'm not sure what the problem is but anytime I take a picture using flash there's a huge white spot at the top of my picture.
If it was a white iPhone 4 and you didn't have that issue then you were very lucky. Tons of complaints about that on every site that deals with iPhones.
Yeah, I had seen this mentioned before in a few places in regards to the white version of the iPhone 4... So I got a black one even though I was originally leaning towards the white one.
Modifications to the Defender case should have helped this, I believe. The one I just purchased has a much larger cut out in the front (for the proximity sensor) and much larger in the back.