I've had my new AVR-520 for a couple of weeks, and in the past day or two I've noticed an interesting problem (well, let's call it an "issue" for now). While watching DirecTV in Logic-7 mode, all of a sudden the surround speakers jump WAY up in volume, almost matching the center speaker. And it sounds like a center channel signal, too (full dialog). I have to spend some more time on this, but have any other AVR-520 owners noticed this? BTW, I use a Hughes GXCEBOTD DirecTIVO and connect it to the AVR-520 with an optical digital audio cable. Thanks!