I've noticed recently that no sound comes out of my surround speakers when viewing DVDs. The speakers are hooked up properly, as the receiver test tones can be heard; I just don't hear anything from the surrounds when watching movies. Does anyone have any idea what my problem could be? For the record, my receiver is a Pioneer Elite VSX-26TX, my DVD player is a toshiba SD-3109, and my speakers are all Paradigms (mini monitors up front, adp-170 surround, and CC-370 center). Thanks for the help.