I searched in vain for the post I mentioned. I was hoping to provide a link, but couldn't find it. It seemed strange that my Tivo stopped working with Dish, and that post seemed to indicate it happened to others about the same time.
I read a post earlier that said Echostar did an auto firmware upgrade that made the IR output controls from Tivo quit working. Presumably this was done intentionally because Dish is now in the PVR market and Tivo is a competitor. My Tivo IR outputs quit working with my DishNetwork receiver...