When listening to podcasts and music on my iPhone, sometimes (in the case of podcasts) there is a 30 sec skip backward button (for music there is a Genius button there) and a slider for changing your position in the track. Sometimes the button and slider are not there, and the only way to move within the track is holding down the forward and back buttons, and no way to see total time and time remaining.
I haven’t been able to figure out any rhyme or reason to it. Is this a bug, or is there some aspect to this feature that I am missing?