Wow, I should have read the other posts before I wrote mine above, or, nay, before I bought the BD-C6500 in the first place.
Two things I want to add. One, I just want to make clear (as others have in their posts) how much effort I have put in so far: 1 chat session w/ samsung, 1 email, 1 hour on the phone, 1 visit back to best buy to swap for a new unit and probably 6-7 hours of at-home studying & figuring. I realize now, that's just too much. I guess the challenge and possible doubt of my WNDR3700 router partly fueled this escapade, but now that I have a recommendation from other battle-worn veterans, the LG BD-570, I think I may have found salvation. The second point regards customer service. The woman (based in the Philippines) was nice enough, tried patiently to help(?) me out, but it's true, the qualifications and/or the equipment were just not sufficient. What's possible though, at this point, is that they actually know these players are permanently flawed, so they are left with nothing else but string you along and point the finger at the router.