This happened to me a number of times. I wasn't recording anything and I didn't ask for any signal test. Waiting a while didn't fix it, RBR did. Some type of glitch I guess.
Best site survey tool.
Try this. Place satellite dish using sun or moon
You'll need this:
DishPointer.com » Satellite Dish Pointer / Alignment Calculator with Google Maps
and these:
99.2W
101.0W
102.8W
109.8W
119.0W
Is there a cable out there that goes Optical on one end and coaxial on the other? No.
Or have I just bought the wrong receiver? Sounds like you bought the wrong home theater system.
Questions
There is more to your Samsung model number, what might that be? How is the picture quality on the other 2 sets? What brand/type are they? How are the receivers connected to the sets? How close are you sitting to the 61"?