So iPhone OS 3.0 Beta 3 is working perfectly on my iPhone 3G and life is good, or so I thought. I have a Shure E110 headphones and a Shure MPA-3C adaptor that has a mic and button that emulates Apple headphone functionality. It's worked flawlessly with OS 2.x but 3.0 betas don't seem to work with the button. I can't click it once to pause, twice to skip and three times to go to previous track like I used to. It's extremely irritating but I can't figure out yet if it's my adaptor, phone or something weird in my particular instance. Does anybody have the Shure MPA-3C adaptor with a OS 3.0 beta and can you report your results??