HouseOFwax, Found the problem. Now everything is working just as it should. Further checking of the code revealed that I had some of the pin connections wired wrong. When I first connected the leds I was not sure just exactly which pair of leds went to which pin. After studying the code under the hardware constants I realized my mistake. I also fooled with the code a bit to extend the display time and the roll time. This has been a great learning experience for me, but I still have an awful lot to learn.