@ScottWorld, this is exactly what was happening. When you originally made the posts, it was generating an embed that used a URL with a time-limited authorisation signature from Loom, for example:
https://cdn.loom.com/sessions/transcoded/48d9de9a084af86fd477202764a9a3b1.mp4?Policy=eyJTdGF0ZQiOlt7IlJlc291cmNlIjoiaHR0W1lbncHM6Ly9jZG4ubG9vbS5jb20vc2Vzc2lvbnMvdHJhbnNjb2RlZC8zODRhNDc3MjAyNzY0ZjhkOWRlOWEwODZmZGE5YTNiMS5tcDQiLCJDb25kaXRpb24iOnsiRGF0ZUxlc3NUaGFuIjp7IkFXUzpFcG9jaFRpbWUiOjE5OTIyODc0OTR9fX1dfQ__&Key-Pair-Id=APKAJBGSW7XQIC5XK7FQ&Signature=h7BfrZiVgz7QFpUgl3BRYwsYC4yel%7E2y8Ctc7NKINXCe-zqvUAOaxQXgT1qUUk1IcSoou6v6Q-XqJNMFnmytU6YPt4n96GxujGoaF1haUZwB3l5HvhOPyJ3cu7RGJtLDQzg2tZFED-Iu%7E2iEZvuvrKh8yb8dhE-6Rt9hzmtJi-FnGXujIjpQ-LOpt0khBAkqhTE0ft0dWUUT%7EF%7ECmts97tWRDfrvmvz-PKkIV1yaie0WvLgKBOWtbptUnX4vliPsCWxVWcxR2NkCFj2UrzxTCCP2PTqXNnP0wkPI1VdvYvZAzda3RkLQclIHEsRsAglVkJNdy0O4qN93nUKaf863Tg__
but we’ve since improved support for Loom videos as other users reported this problem on meta you can see here.
If you Rebuild HTML[1] of old posts containing Loom videos, they should now onebox using the embedded player rather than the stream URL and work indefinitely.
