iOS applications built using AppGyver (http://www.appgyver.com) crash on launch in iOS 9 (but function in iOS 8) when wrapped with MDX Toolkit 10.2.1.
You may see the following in the console logs.
Nov 16 14:53:11 iPad HelloWorld[452] <Warning>: -[NSFileManager(MdxEncryption) ctxRemoveItemAtPath:error:]: errno=2
Or the following in the crash logs
Last Exception Backtrace:
0 CoreFoundation 0x26692676 __exceptionPreprocess + 122
1 libobjc.A.dylib 0x3812ae12 objc_exception_throw + 34
2 CoreFoundation 0x265b132e -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 338
3 CoreFoundation 0x265b11b2 +[NSDictionary dictionaryWithObjects:forKeys:count:] + 46
Solution is to wrap the applications using the 10.2.0 MDX toolkit.
EDIT: It seems that AppGyver has released a new version of the wrapper that addresses this issue
https://github.com/AppGyver/wrapper/blob/master/changelog-ios-edge.md