True HD and Onkyo 606 question

[connect42]

This is a spinoff of another thread that helped me out greatly. The link to that thread is here (https://forum.blu-ray.com/showthread.php?t=85746)
for anyone having problems getting TRUE HD to show up using the Onkyo 606 and a Blu-ray player.
However, I have a few more questions that fall under a slightly different category.
1) I get the DTS light, just not the TRUE HD light on The Dark Knight. Then I tried Iron Man and the True HD light came right on. What is the deal with that? Both have a TRUE HD track. Why different results with different discs? Am I doing something wrong with The Dark Knight? I just put the Iron Man disc in and it worked perfectly.

2) In the setup menu on the Onkyo 606 under the "hardware" section there is a selection labeled "HDMI". The first option is "output selection". Mine is set on "through". Is that correct? Should it be set to something else? I have my DirectTV HD and Blu-ray running to the Onkyo via HDMI and the Onkyo running to my TV via HDMI.

thanks in advance,

Brian