Are you using Chrome?
It stopped working in Chrome for me. But works in Microsoft Edge. Actually stopped working and after restart worked again until it did not.
I don’t get a caught up message, just two blank posts and nothing more after showing the reels.
Works fine on my phone and tablet.
I tried Chrome, Brave, Edge and a mozilla browser. None of them work, in Windows 10. If I log into Windows 7, FB works fine. I’m about ready to jump back in W7 in a few short moments. Maddening.....