This discussion was created from comments split from: Managed user using a Roku is able to enter main account without entering password.
The Roku app also has a bug that allows a managed user to see Channels. This is a very real problem as I can't restrict what my kids watch on Roku since they can:
1. Switch to my admin user account
2. Use Channels which contain adult video channels.
I wish either Plex or Roku would fix this. I've complained in both places about this before. And like the OP, DLNA is not enabled.