You have Yamaha receiver?
See here...it works for me...EVERYTHING!!!
http://www.futeko.com/newforum/index.php?topic=793.msg6065#msg6065
the "problem" with DTS-MA is no fault...that is base on decoder works on my Yamaha....As soon as I enable DSP...I have 9.1 channels used again.
DTS-MA just does not contain any height-speaker information that is why.