I think I have the polarity correct on the led's with the anodes connected to DIG pins and cathodes connected to SEG pins, but ALL of the led's light up. If I switch the anodes to SEG pins and cathodes to DIG pins, NO led's light up. I seem to have a similar problem to this thread: http://arduino.cc/forum/index.php/topic,11453.0.html. Can someone help?