Probs best putting this in feedback. Aa with any operating system update, not all apps are going to work since the apps are designed around the apk that they have access to. Give it a week or so and there will no doubt be an uodate that will support ios9
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Kind bad on Bs part though. Every other app on my phone had a day one ios9 update apart from this one, and registered developers get the new OS well in advance.