I have same problem. I flashed my phone and installed 1.3 but it is still a same. It was working few weeks ago but now it only indicates that transmitter is on and there is no audio on speakers, but I can't receive anything on my radio.

I also tried commands from this thread but I got no errors and no success. Transmitter indicator turned on and speakers stopped playing and that is it.

when I go on apt-get update, then apt-get upgrade I got message that libsdl-mixer1.2 is kept back.