I find an easier solution than remove configuration files and restart twice my device : I just unplug and plug my headphones WHILE FM Radio Player is running and has focus.

When I said in my first post that I try this, I stopped FM Radio Player during the manipulation.

But in transports, I swich a lot between radio and my own music : this generates the problem for sure on my phone. And I am not sure if I make this unplug/plug manipulation everytime, it is good for the hardware.

One thing is sure, before I upgrade to PR1.3, I didn't have this issue. Is there any other program that use FM receiver to check if the issue comes from FM Radio Player itself or from libraries it uses ?

@otrocoke : I try to start FM Radio Player by your command line, I never could have any sound (and I don't have any message in the terminal about missing headphones). Even with the by-pass I explain before, I never can have sound if I start by command line.