DB and Streamer 317, thank-you for your help. Turns out, it was my wireless router that was causing the issues with my Roku Channel. After successfully testing the channel on my hotspot, I rebooted my router and all was good. Thank-you again for your assistance. You guys rock.
Everyone is going down the wrong rabbit hole on this one. I have had this happen to me several times in the last weeks. Go into Settings, Display type..., set it to the lowest resolution that your display can do, answer yes to any prompts. Then set display back to Auto Detect, again answer yes. Playback should now work. There seems to be a bug on the Roku that does not re-detect the display properly after a power cycle.