ARC Not controlling Aurora 8 LT-FW

Recently I updated my Aurora 8 LT-FW firmware to Rev. 28 which should be the latest.  I also upgraded the ARC to version 18h, which I believe should also be the latest. Everything turns on fine; the ARC loads when the Aurora is on, so it knows there's an Aurora there.  However, when I try to control the Aurora with the ARC, nothing happens.  I took at look at the "About Aurora Remote Control" window and noted it was the right version, but there's no associated Aurora there.  (See screenshot)

When I installed the new version of ARC, there was a period of time when I had the old version and the new version on the same machine, so I took a screenshot of the old ARC to contrast and compare the settings.  Hopefully someone can help make sense of them.

One other thing I didn't point out specifically in all of these is that the old version of the ARC only shows 8 channels (which I assume is correct, given I have an Aurora8), while the new version shows 16.  I thought maybe I had an incorrect version of the ARC (maybe there are separate versions for the Aurora8 and Aurora16), but from what I could tell on the website, that's not the case.

I should mention that even though all of this is true and it doesn't seem that the Aurora is connected, when I make changes in ARC, they do show on the front of the panel as having been changed.  However, none of the mute buttons work, nor do the input dropdowns, lock/unlock buttons and so on.

Finally, I do get sound out of the unit, I just can't control it...

Any and all help is greatly appreciated!

Thanks,

Steve