Might want to try making sure you've got the latest app version if you haven't already. Beyond that, might want to try posting in !loops@lemmy.world. Logging in works for me 🤷
Oh, I don't think the web version allows for browsing videos at this point. It's still in heavy development. I can log in on the web on Firefox, but that just lets me change account settings and whatnot.
What do you mean by Loopless? I'm running GrapheneOS with sandboxed Google Play services that isn't logged in to any account and the app works normally as far as I can tell. At any rate, might be worth posting about in !loops@lemmy.world, someone else might be having the same experience as you.