Stable and Beta not Playing

Hello everyone,

I'm having trouble with both Smartube apps (stable and beta) on my Android TV. They both load up normally, but whenever I click a video, all I get is the black screen with the spinning circle.

These are all the things I've tried:

1. Restarted TV
2. Restarted router
3. Deleted internet history on TV
4. Cleared cache on Smarttube app
5. Deleted history on Smarttube app
6. Opened Settings and made sure that Network Engine is set to Cronet
7. Opened Developer Options and made sure and Prefer IPv4 DNS is selected
8. Uninstalled both apps (i.e. stable and beta) and reinstalled them (and made sure Cronet and IPv4 DNS are selected)
9. Restarted router and unplugged TV for 30 seconds

I don't know what else to do.