I have an Uno 1.0 so it doesn't have a pin for IOref. Do I need to do something with that pin on my shield?
Make sure you have the headers alighend properly. You should have 2 extra pins hanging over the end of the header on both sides. IOREF and an unmarked pin near "Reset" and SCL and SDA near "AREF" on the other side. These are redundant pins added to R3 boards for compatibility between UNO and MEGA. You do not need these pins for operation, but they are exposed, so make sure they are not shorting out against anything.