Recently I discovered that the XMEAGA-B1 Xplained demo app that comes with atmel studio 7.0 does not work "out of the box" with the XMEGA-B1 Xplained kit.
With Atmel 6.2 I had no problems at all!
atmel studio 7.0 version info:
atmel studio 6.2 version info:
This problem is not blocking for me, maybe somebody else has the same experience. In this case Atmel them selves should fix this.