Originally posted by THancock
The confusing part is that I get DD 5.1 with 42.1 (CBS) when it's available (sporting events), but not ABC.
I'm not saying this is what's happening in your case, but if the station is sending incorrect (non-standard) PSIP data, that may cause some brands of receivers to not recognize the DD 5.1 flag. It's possible that is what's happening with ABC 33/40, since some people report getting DD5.1, while you don't.
Our local ABC affiliate had a similar problem. They made some incorrect PSIP changes which prevented certain brands of STBs from getting any
audio. It took over a month to convince them it was something they had changed in the PSIP data that was causing the problem.