there seems to be a bug within IOS7 IAA.
As indicated in the 1.7 Update thread:
"Connected node apps don't always appear in the iOS multitask mode when you double tap the home button. This is an iOS 7 issue which can lead to connections failing. As a workaround, launch the node app manually from the home screen, then double tap the home button and swipe up to quit it."
Ludwig Goohsen, Software Developer
Steinberg Media Technologies GmbH
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