iOS: XCode 6.3.1 Crashes with QtCreator Generated XCode Projects

The issue has started after update
and/or installation of latest XCode - 6.3.1
Steps to reproduce.

1. Use QtCreator's Wizard to create a new project
that could be QtWidget or Qml based
or open any existing project;

2. Build it and run on device - it runs properly;

3. Open the project by XCode-6.3.1

4. Click on the Target - (see Fig-1) sometimes it's enough
to get the crash.
If not crashed - switch from Devices Universal to
iPhone or iPad and/or play with other parameters
at the screen (see Fig-2) attached.

5. See the XCode crash attached as well.

6. Now open a new project from Xcode
and observe that actions as in paragraph 4 are working properly,
and there are no crashes.

Suspected issues with xib file format or storyboard
generated by QtCreator.

Note that I've not played with QtCreator projects
for Mac; it's worth checking as well.

Expected behavior:
QtCreator-generated project to be compatible
with XCode and do not crash it.