I am operating within an established Enterprise installation.
- It was recently updated from 10.6.1 to 10.9.1.
- I am a Creator with a custom publishing role (sharing permissions to existing groups)
- Before the upgrade, I had no problem sharing to established groups.
At 10.9.1, I published a hosted feature service with editing enabled and no sharing. If I then attempt to use the Portal sharing interface, this is what I see when I attempt to share to a group:

In the context of an Enterprise Portal, what is a "Public Account"?
If I just ignore this and hit update - I do NOT have rights to share something publicly (we don't want that) - the Portal informs me that I do not have rights to publish something publicly, and does not allow me to share to a group.
Again - Public Account in Portal? I am completely confused.
Thank you all for any insight.
--Adam