Travel Technology - Slingbox AV help

I've posted this problem on Sling Community and have gotten no help, and called Slingbox support have gotten no help either.

I have a Slingbox in my family room conntect to my router via powerline ethernet, as well as a separate slingbox connected directly to my router in another room.

Within my network at home, I can see / view both my Slingboxes just fine.

Outside of my home network, I can only see my slingbox that is connected directly to the router, and not the one connected via powerline.

I used to be able to see the slingbox connected via powerline at first a year ago, but sometime during the last year there was a firmware update for both slingboxes, and now I can only see the directly connected slingbox.

Any ideas on what may be wrong and what I could do to troubleshoot this?

On the regular Sling when I had a seemingly caused by firmware update problem, I just rolled back to an earlier version and it works just fine now. That may be one fix.

Are both slingboxes trying to access the same port? What port is each setup for? I use three ports for my three slingboxes.