It turns out that the high-tech tupperware container I was using to keep my satellite junk out of the rain turned to dust in the sun. I assume that's why (even though it hasn't rained in months) the left side of the stacker stopped working, as well as with the odd-numbered channels on both LNBs. Which means DirecTivo won't tune any channels, even the odd ones, because it can't get new program data and panics. Good times.