Is the glass backing of iPhone 4 susceptible to scratching and breaking when used with a slide-on case under certain conditions? GDGT, the gadget-centric social site run by Peter Rojas and Ryan Block has sent out their latest newsletter with an article titled "With Antennagate over, is Glassgate next for the iPhone 4?" In it Block claims:

According to my sources both inside and outside Apple, after Antennagate the iPhone engineering team identified another potential design flaw that appears to have sent them into a quiet lockdown, and has them working behind the scenes in what's been described to me as something of a quiet panic to preempt any further tarnishing the iPhone brand. Apple has apparently found that non-bumper style cases -- specifically those that slide onto the iPhone 4, which are occasionally prone to particulate matter getting caught between the rear of the phone and the case -- can cause unexpected scratching that could quickly develop into full-on cracking or even much larger fracturing of the entire rear pane of glass. To put it another way: Apple is afraid you might buy a standard slide-on iPhone case, put it on your phone, and then discover the next time you take it off that the entire back of your device has been shattered by no fault of your own.

He claims Apple engineering has gone into lockdown over the matter and Apple's trying to make sure no more slide-on cases make it into circulation, if possible.

Now I've used several slide-on cases for my iPhone 4 over the last few months and I keep in in my pocket where it gets all manner of particulate matter, and I've never had a problem nor has anyone here at TiPb (and we know our cases). However, even a few antenna videos became a huge PR problem for Apple and this could just as easily be another one depending how it pans out and how -- or even if -- Apple responds.

Of course, Georgia's been asking from the beginning why Apple would go with a glass back given all the associated risk that comes with it, even from an accidental drop.

In the meantime we're asking you, if you use a slide on case, have you had any problems?