Unreal Engine 4.9 Released!

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UE-21000 is actually same root issue as UE-20952 (Launching a Project which uses Depth of Field crashes to Home Screen on iOS8 device), and fix will be included in 4.9.2 Hotfix.

Your other issue (with Enumerators in Blackboard) was logged as UE-20867 and has already been fixed and released in 4.9.1 Hotfix.

Cheers!
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Thanks so much to hear this greate news!
However,actually in 4.9.1,I still have this AI issue,which in 4.8.3 never occurs:I have posted a bug report on my own while using 4.9.1,one of staff told me it was still under investigation…