Certainly this problem can be irritating (I started this thread, after all), but it really doesn't prevent one from using and enjoying the system. Fortunately, in my case, it comes and goes - and seems to defy any predictable logic about when and how. I was tribbles-free for weeks, had doubling for a week, and am now clear again.

My Kit: 861v8+ID41, 800v4, UHD722, MD600, MS600, MS200, Oppo BDP-203, Genesis 201, Genesis 350 SE, Genesis S4-8 Sub, BG 520i, VTL MB450 II, Krell Showcase 7, Genesis 928 Subs, Danley DTS10 sub, SVS Ultra 16 subs.