I had a bad experience after upgrade from Snow Leopard to Lion.. After upgraded iCal can't sync the new events thru Mobile to my iOS devices (e.g. iPhone, iPad). Its just only can sync back from MobileMe. That's mean....iCal on my iMac can got the events from MobileMe, can't update new event to MobileMe that I created at my iMac. Do any expert can give me a hand? Attached was the prompted at iCal.. Thx very much!!!!