After installing of Xcode 6.0.1 beta 2, I too was encountered with this problem.
My project has iOS Deployment Target is 6.0
Using answer of @AlexZd, I did next actions:
I found all xibs, which will created / displayed at this moment
Before my actions this xibs had next standard settings:
- So, for every of xibs, selected by me, this settings was changed on next settings:
Now, check work of it. If this does not works, then do control actions
4.
1) Clean your Xcode project by CMD + SHIFT + K,
2) Clean ~/Library/Developer/Xcode/DerivedData folder by hands
3) Remove app from device and then run it via Xcode on this device
This solution was checked by me on 3 iPads with IOS6, IOS7 within IOS8 too. This works perfectly on any of them!