I actually had something like this happen to me during an install when I hooked up a center with both leads going to the postive terminals on a bi-wireable speaker (couldn't see behind too well, had to pull the speaker out to find that out. It would play fine in stereo, and low on any modes that used the center, but as soon as you turned it up, the receiver would shut off (Onkyo 601).
Do you have your DVD player hooked up via digital or analog or both?