According to CNET.com – Apple is seeing a lot of problems with the glass back of the iPhone 4 when paired with certain cases that cover the back of the phone. I have an Incase iPhone 4 case and can report that I have seen none of the mentioned issues. Have any of you seen this problem?

via CNET.com:

Apple likes glass. A lot. You can tell that much from its many retail stores, and in its products where glass is used in displays, notebook trackpads, and both the front and back of the iPhone 4.

That last place, though is what might be causing the company some headaches.

That’s according to a report today from Gdgt, which says that slip-on cases — the kind that cover the back and sometimes front of theiPhone 4, have been the cause of serious cosmetic damage with the backside of the iPhone. Dirt and other loose bits of debris from your pocket end up in that space.

Over time, that can lead to a shattered backside as small scratches grow to become large cracks that travel across the back of the device, much like a ding on a windshield.

This has become a big enough problem, the report says, that Apple’s engineers have been hard at work in “a quiet lockdown,” testing various third-party cases to see how widespread the problem is, and presumably to make sure it does not happen with future iterations of the device.