Logitech Pure-fi Express Plus

Hi, like many "sound dock" since the ios 4.2 update I'm not able to lisen to my music. My Iphone is charging, but a pop-up tell my the sound dock doesn't support my iphone anymore. I've done a reset on my phone and "Pure-fi", that changed nothing. So what I could try?? I'm pretty sure it's a firmware bug from Apple...When are they give us an update!?!?!