movies that say 7.1 dts mastes aud. but only play in 5.1

[hardiride69]

I have this for my set up--a pioneer elite vsx-94txh reciver , sony bdp-s550 blu-ray player and a ps3 and all hooked up using hdmi and set to bitstream . ALL UPDATES DONE AND UP TO DATE . and all 7.1 one speakers all hooked up

heres my ? why is it when i have Blu-ray discs that say: DTS Master Audio 7.1 (Rambo: The Flight Continues, X-Men: The Last Stand) lights on the receiver indicate that 6.1 or 7.1 are operating, but I have also bought movies The Condemned (DTS-HD High Resolution Audio 7.1) and T2: Judgement Day (DTS-HD Master Audio 6.1) they only indicate that is only playing 5.1.

Has anyone else ran into problems with movies like this? I've messed with various settings and still no luck.