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There is 7.1 on Blu-Ray, I believe. It is 7.1 LPCM if I remember correctly.

The OP is not getting output from his surround backs, so stating that he wouldn't get 7.1 was irrelevant anyway, at least in the search to find the problem. Not to mention DDEX, and DTS-ES do not support 7.1 in the first place.

On the receiver there is a flip-down panel, it says Denon Link on the panel. After flipping it down to the right of the cursur and enter keys, at the bottom is a button that says surround back, try pressing that. If I remember correctly, it is an overide funtion that allows 5.1 material to be...

Maybe it is just the button under the flip-down panel.

That is incorrect, the receiver will matrix the surround back channel with standard 5.1 tracks and just as well DTS Neo:6 and Dolby Pro Logic IIx matrix 6.1 from 2 channel sources.