Thanks for the note here. Have you tried removing the channel from the Roku home screen by navigating the to the channel tile, pressing the * key, and choosing 'Remove channel'. Then, restart your Roku device. Once it loads up again, try adding the channel back once more.
As a reminder, if you are located in a region outside of the US or Canada that does not support The Roku Channel or allow playback of content, you may experiencing behavior such as this.
If you are still seeing an issue from there, please PM me with your Roku account email address, the serial number of your Roku device from Settings>System>About, and more information about which specific content you are experiencing this issue on when trying to watch. I'll follow up directly to assist you further.
Roku Community Manager