I suspect you are running into some timing issues associated with the digitalwrites in the old style shiftout. Shiftout is now included in Arduino, take a look here to see an example. The 595 tutorial has not been updated yet.
I suspect you are running into some timing issues associated with the digitalwrites in the old style shiftout. Shiftout is now included in Arduino, take a look here to see an example. The 595 tutorial has not been updated yet.