On my build of the new SSC, the check sum from the Pic Kit 3 didn't match the checksum in the Wiki, after programming the Pic.
I tried and tried to re-flash the code to the Pic (Pic Kit 3 reported that the Pic flashed correctly, and even read back the flashed code) but the checksum just wouldn't match.
Scratched my head for a while, then I swapped out the Pic Kit 3 RED usb cable that came with the Pic kit 3 with another USB cable, then it flashed correctly and the checksum matched.
Quite surprised that the RED usb cable failed