One important thing i forgot:
The value of MAX_WORK_COUNT in klondike.h has to match the value in the driver of cg/bfgminer.
In the github-repository i set it to "8" everywhere.
So when you are using other non-patched mining software (bfgminer for example), be sure to change it to "8", too.
@cdragon: Why are you hashing at 500 MHz?