I installed a new copy of Wheezy (5/5/2015 I believe is the latest) and HG. With both 499 and 500 I still have partially working CM15A. It works, but when it receives commands there is a 5-10 second delay because HG is not communicating with the controller correctly and resends the command 1-2 times.
For those that found that starting from scratch fixed the problem, any guidance on exactly what you installed would be helpful to figure out what I (and others) are doing differently to get a different result.