Open Xcode 7 project in Xcode 8 breaks simulators

Originator:indiekiduk
Number:rdar://28833322 Date Originated:
Status:Open Resolved:No
Product:Xcode Product Version:8.0
Classification:Bug Reproducible:Yes
 
Summary:
When you open an old Xcode 7 iOS project in Xcode 8 the simulators are all missing, and it is not possible to add any simulators, Xcode appears to be in a broken state. A workaround is required to fix it (in additional notes below).

Steps to Reproduce:
1. Create an iOS project in Xcode 7.
2. Open the project in Xcode 8.

Expected Results:
Simulators should be usable

Actual Results:
Simulators are missing

Version:
Version 8.0 (8A218a)

Notes:
You can workaround this issue by quitting Xcode 8, right clicking on the xcodeproj to show package contents and delete the xcuserdata folder. Now opening the project again in Xcode 8 and the simulators have returned. Unfortunately any time an Xcode 7 project is openened in the future then this bug returns again. So something is wrong with the xcuserdata between Xcode versions, it is not backwards compatible maybe.

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