Seems we are not alone (see thread new comer in Feathers also).

Heres Spektrum response :

Im at a loss as to what to tell you. Ive bound the
AR6000 and BR6000 successfully with this radio without any issues.
There is no reason the receivers should not bind with this new
transmitter. There is no issue with compatibility from our standpoint,
but I am unsure where to tell you to go next in order to successfully
correct the issue. I will forward the issue to our development team for
further review.

So if we hear anymore well let you know. But sounds like we need Spektrum to hear more issues directly.

Ian