On a personal level, I've had an issue with a redmere HDMI cable and a UHD capable Panasonic when run through a new (HDCP 2.2 capable) AVR.
I'll be interested to see how many cables can handle the new UHD Blu-ray's... many cables bring big claims to the game, how many can back it up?
I have a hunch that a lot of marginal setups will be unmitigated disasters, but hey, that's the price early adopters will pay.
Was this Redmere an "Active" or passive type HDMI?
The active types have a chip to do magic to the signal, some are 1 direction orientation cables.
Passive, sourced from a Chch supplier.
It didn't matter what way it was implemented, it only worked when it was removed from the system.
Once the product was identified as the problem (the cheapest in the entire system by far) I put it down to experience and moved on.