Has anyone noticed the DVD's with an EX flag sometimes trip the VSX-37tx into EX or 6.1 mode? My phantom menace DVD does not flag the receiver, yet my Jurassic Park 3 does. What gives? I checked all my settings on the receiver and separate amp. Just worried that something isn't working, that's all. I have been going to manual on this one when dealing with some EX DVD's. Thanks, David L.