I was using Xcode this afternoon and debugging an app on my device just fine. When I got home from the office and plugged in my phone to keep working, XCode would no longer
Well I don't know why this helped, but if anyone else sees this thread the thing that "fixed" the problem was to remove the SDK from my machine, restart XCode, then plug in the device. XCode then popped up an alert view asking to collect the debugging symbols from the device, which I allowed it to do. From then on it worked like a charm.