I have a brand new Roku stick at the office and a Roku box at home.
At office: Discovery Plus is a black screen when I open it, pressing home gets me out, but I can't do anything else. Also Poker Go I am able to see the toolbar on left but just a spinning circle.
I am able to watch both on the home device.
I am able to watch Sling on the office stick.
I had an older stick thought that was problem, bought new one which didn't help.
Roku Stick: Model: 3820R2 Software 12.0.0 build 4184-E6