I find the opposite. I have a motorola dcx-3400 set STB and when I switch to the revue, the revue is much louder and I have to turn the volume down. As for the STB, it is the same as before I got the revue.
i have it STB(dish)-Revue-TV with optical from the revue to the AVR and if i restart my revue with it set to pcm the volume will be way too low. but it i switch it from dolby then back its fixed(till another restart).
probably not the same problem as you guys tho. i use pcm when watching netflix and non hd channels so my avr can do pro logic. and use dolby digital for hd channels. through hdmi i was getting stuck with 7.1 heh