I installed iOS 10.3.2 and it didn't seem cause any problems with Band-in-a-Box or other apps in my testing.

But I should also mention also that I have not personally seen this warning message, I've only seen references to it on various blogs and news sites. I have no idea why it doesn't appear on my device. Also I can't at the moment find any information directly from Apple about this, either in the Apple Developer area or in fact anywhere on Apple's website. I am likely overlooking something. Either way, we will look into it.
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Andrew
PG Music Inc.