I just got my first Riva 510 yesterday and it worked beautifully. It was on the charger all last night. I just now tried to take a drag, and the light blinked a bunch of times and nothing happened. Now the light doesn't light up at all when you press the button. What happened? I put it back on the charger, the LED on the wall wart is red, and the LED on the usb part that is connected to the battery is glowing green. I'm crushed.