Freezing when calling another app

[KeyWeeUsr]

I downloaded the debug .apk, but I experience really weird behavior. On each webbrowser.open('tel://...') or tts.speak('hi') or anything else that can trigger something from outside to appear (dialer screen, tts options, etc), the shell freezes. But not in a casual way that you can easily press home button and stop it. No, the shell freezes everything (lockscreen works) and to exit it I need to hold power button until the menu pops out. Only then I'm able to press home button and later force stop the application.

Anything else that doesn't call another app (e.g. plyer.vibrator) works normally.

Samsung Galaxy Note 2, 4.4.2 stock