I don't believe Roku censored Newsmax but the app on Roku does have to update. Try to go to left menu and scroll down to live tv sometimes I have to try several times but it usually works. I hope this helps.
With sound and no picture it seems your tv wasn't in sync with input device. Try turning off for about 20 seconds and reset to input device if that doesn't work try doing the same with Roku device. This works with me most of the time.