I don't know if that's true about the 2 channels. I don't think it should be.

I think what Paul meant was that the Lynx card is always outputting clock through the cables when it's the master however, syncing via AES won't happen automatically unless you lock the DA7's clock to one of the card slots. What happens when you do that?

"syncing via AES won't happen automatically unless you lock the DA7's clock to one of the card slots. What happens when you do that? "

Yes, but how do i do that? I can't seem to find it in the 7's manual I find vague references but nothing in the way of instructions that i can follow.

If you look at the manual, Page 12-7...
Go to the Digital I/O -> Input Set window.
Once you have your AES card in, and it is talking to something else, it should show Locked next to the slot. You can then choose that slot to be the master clock.

That did the trick...problem solved
Thanks to everyone who contributed