Hi, I have the first generation Phantom and loved it so much, I decided to purchase the Phantom 2, because of the built in gimbal. When I first flew it, it worked fine with the green and red LEDs then the all green LED saying I'm hooked up with enough satellites. Recently all I'm getting is the yellow lights, which says I'm in "att" mode. I tried the advanced imu calibration as well as the compass calibration (many times), but the same thing happens. I observe on the assistant software, for the upper right toggle switch, there are three position,s all marked "normal flight" with an option on the last one for failsafe. I thought that the first position would be marked GPS similar to the assistant software for the first generation phantom. Could someone please tell me why I'm not getting the green lights? Some assistance would be greatly appreciated. Thank you.