I'm not sure what surround mode I'm using currently. I hit the STD button on the remote and it shows Dolby Digital on the AVR when I'm playing 5.1 movies. It shows DTS though when I play DTS movie. I will check the surround parameter setup later today and change it to DD PLIIx if it's not in that mode.
I'm still learning the AVR and it's remote. Gosh, Denon's manual is really bad. I've heard about it before, but I thought "how bad could it be?" I guess I know now it's pretty bad