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Summary:
If you specify size classes in .xib files then changes that you make in Regular x Regular size class are not applied on iOS 7 iPad.

This problem is reproduced only with .xib files, not storyboards which work as stated in documentation:
"Size classes are backward compatible when:
- The app is built using Xcode version 6 or later;
- The deployment target of the app is earlier than iOS 8;
- The value of the height component is not compact."

I've attached a sample project to demonstrate the issue. There is a view in CustomView.xib file with two labels in it: first one with text "iPhone" and second one with text "iPad". "iPad" label and its constraints are disabled in Any x Any size class and enabled in Regular x Regular size class, "iPhone" label and its constraints are enabled in Any x Any size class and disabled in Regular x Regular size class. View from CustomView.xib is loaded and added to ViewController.

Steps to Reproduce:
1. Open project in attached archive.
2. Run it on any iPad with iOS 7.

Expected Results:
You should see label with "iPad" text.

Actual Results:
You will see label with "iPhone" text.

Version:
Xcode 6.1(6A1052d), OS X 10.10 (14A389)

Notes:
http://stackoverflow.com/questions/24172860/how-can-xcode-6-adaptive-uis-be-backwards-compatible-with-ios-7-and-ios-6

Configuration:


Attachments:
'SizeClassIOS7Bug.zip' was successfully uploaded.

Sample project: https://github.com/imaks/SizeClassIOS7Bug