If I understand correctly, my 990 behaves the same way as jrlouie's. Here's an example. ESPN-HD broadcasts in DD 5.1. ABC-HD usually broadcasts college football games in DD 2.0. I start off on ESPN-HD and the 990 correctly goes to Dolby Digital mode. I then flip to ABC-HD and the 990 stays in DD mode. Wanting surround sound, I select DD+PLIIx. I then switch back to ESPN-HD and the 990 stays in DD+PLIIx mode instead of going back to just DD. I change the setting then have the same issue when I change to ABC-HD.