Server Version#: 1.25.9.5721
Player Version#: 1.43.4.2971 (Windows 10 instance. Also on various other devices)
7-10 days ago or so, Plex stopped updating IMDb ratings (often upon upload, but, generally, it terms of “refreshing”. In some cases when new movies are put on (again, last 7-10+ days), an IMDb rating is included. In other cases, Rotten Tomatoes ratings are included. Rotten Tomatoes rating seem to update when refreshed, but are not replaced by IMDb ratings, even when IMDb clearly has ratings. New movies that initially included IMDb ratings, do not seem to update upon refresh, even though the rating is different on the IMDb site.
