Ah, I bet I know the problem, too. DirecTV seems to be using a standard set of codes across all their devices, but they have two different inter-code pause timings and three different carrier frequencies. I don't have all six permutations covered yet; so the L12 is probably using a compatible carrier frequency (since it does sometimes recognize the codes), but doesn't have the right timing. I've probably got the right choices down for the HD model.

Good to hear that some DirecTV receivers are working, though! I'll try to put in coverage for the other varieties in the next update. It looks like Pierogi might finally have some ability to deal with satellite receivers after all...