Thanks for reaching out here in the Community!
Did you restart your Roku device before re-installing the channel? That step is crucial when performing troubleshooting. If you haven't tried the suggested order (remove > restart > re-install), we would recommend giving it a shot once again. We also suggest doing the restart from the Settings menu by navigating to Settings > System > Power (If you do not see a Power submenu, skip to the next step.) > System restart.
To help troubleshoot the issue further, follow this link: How to resolve a channel playback issue
Hope you'll find this info useful. Let us know in case you've still got any questions