Resolution (for me)
I was having this same problem, and the following solution worked for me. Some subsets of it did not work, but there may be less that is required.
a) quit Xcode (and therefor the GDB it is running)
b) unplug device
c) delete app from device (hold icon till x appears)
d) turn off device
e) turn on device
f) plug in device (if itunes wants to sync, let it finish)
g) launch Xcode
worked for me
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