Thanks very much!

I am going to assume the LCDs from Crystalfontz don't work then. I ran the program and got nothing. Everything else on the PIC works fine. I have tried both of the LCDs I got from them, and the most I can see is line 1 and line 3 lit up with squares if I vary Vo.

Does anyone have any good sources of 4x20 LCD displays?

Thanks,
Tom