The program has unexpectedly finished.

Every time I run a program (chosen from examples, it dos not matter witch one) this happens:

1) The program is successfully build (no error messages shown) and starts.
2) It works correctly until I try to change the application window (for example to move it a little or to change the dimensions of it). Then the app immediately crashes.
3) The Application output window shows this message (Starting /Applications/QT/5.1.0/clang_64/examples/quick/demos/build-maroon-Desktop_Qt_5_1_0_clang_64bit-Ladění/maroon.app/Contents/MacOS/maroon...
QML debugging is enabled. Only use this in a safe environment.
The program has unexpectedly finished.
/Applications/QT/5.1.0/clang_64/examples/quick/demos/build-maroon-Desktop_Qt_5_1_0_clang_64bit-Ladění/maroon.app/Contents/MacOS/maroon exited with code 0)

See the attached file for complete information. (Sorry for my English.)