Update. I tried a combination of suggestions offered. After removing the app, turning off the Roku, restarting and re-adding the app it worked!
Curiosity stream was the only problem channekd I was having with my Roku 1 Channels.
Thank you all for your suggestions
Is CuriosityStream the only channel that you observe this issue with? It's possible there may be an issue within the channel itself that the service provider will need to investigate.
Try removing the CuriosityStream channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote and choosing 'Remove channel'. Then restart your device from Settings>System>System restart. Once your player starts up again, add the CuriosityStream channel back once more. Does this clear up the issue you are seeing?
If you're still experiencing an issue, try checking for any system updates in Settings>System>System update>Check now. If the issue remains unresolved, I'd recommend reaching out to CuriosityStream directly to report the issue and request additional support. Many channels on the Roku platform is developed and maintained by the channel provider directly, and they'll be able to best assist.