Feedback API prevents app from beeing closed on Nokia C7

Using Feedback API from Mobility prevents application to be properly closed. By properly closed i mean application window disappears but process seems to stay opened in background or at least not all destruction is invoked properly. It can be checked while connected to Qt Creator and Application Output does not show 'Finished' and stays connected to the app.
The same problem does NOT seem to occur on Nokia XM 5800 (compiled against Qt 4.7.3 for S^1).
I do not attach minimal app that shows the problem as it can be reproduced with HapticsPlayer example for Qt Mobility examples.