Nokia Nseries :: Sat Nav Voice Over FM Transmitter Stopped Working?

I have just upgraded from nokia maps 2.0 to version 3.0. Prior to this if i had my music playing and the sat nav giving me voice directions over the fm transmitter in my car the music would be stoppped while the voice read out the instruction over the radio speakers, this would then revert to the music playing over the fm transmitter again, oh how perfect it was. Now unfortunatley after upgrading to nokia maps 3.0 when my sat nav decieds to give me verbal instructions all sound is taken from the fm transmitter and comes from the phones internal speaker (not via my car stereo) and to top it all of it doesnt even shut down the music that is playing so i have to try and decipher the sat nav instruction over the music, is anybody else having this problem or is it just me and more to the point how do i fix i