I have tested the Jitterz Coffeehouse app on a variety of devices (both iOS and Android) - inside Ion as well. In all tests the map loads fine after dragging away from the default place.
The problem that you describe could be some temporary google maps issue. Can you try that again?
You can also try and reinstall Ion and redeploy the app.
If this does not help, please write us back with some more details on the device and OS version that you are testing on - iPhone 4/4S/5, iOS version.
the Telerik team
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