This is an old post but I can offer a couple suggestions.
First, it is not good practice to put a print statement inside an ISR. A better option is to set a flag and then initiate the print in the loop if the flag is set.
Another suggestion is to check the following post to see if your Rev2 is assembled wrong.
Lastly, my board had the manufacturing defect described above. I returned it and am waiting for the replacement to arrive. I should get it in a few days and will let you know if your code works on that board.