Using the latest version on an AtMega1260 (ie Arduino Mega) with clock/data on 10/11 with the 12V dome modules and 12V rectangular modules gives no compiletime errors but hangs execution of the code.

Code can be found here: https://gist.github.com/3f9ae167ca66ff741a68

Absolutely no experience with lower-level stuff on Arduino; tips for debugging at the least would be handy.