Issues with ADK

I recently purchased a Mega ADK, but it doesn't appear to be working. I've uploaded a few sketches to it, one using a Serial 16x2 LCD, the other using a GPS module. Neither worked. I then uploaded the sketch to an UNO, and it worked perfectly. I did however try a basic blinking LED, and it worked (using the same pin i was trying to use for the LCD and GPS (6)). Any suggestions on what I may be doing wrong?

Mods feel free to delete, else I'll just leave the answer to my own problem I figured out shortly after posting this. Hours of trying to figure this out, and it was a simple quote from the wiki that solved it.

Not all pins on the Mega and Mega 2560 support change interrupts, so only the following can be used for RX: 10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69

It will help other people with similar problems.