Renaming files -- do I need to completely re-import my library?

[JuiceWSA]

Play History is held in a vault somewhere - unaffected by even “The Plex Dance”:

The Plex Dance ™

The purpose of this is to remove all cached metadata and xml data for an item that Plex usually keeps. This helps when you want to “start from scratch” for particular item move all files for the media item out of the directory your Library is looking at, so Plex will not “see” it anymore scan the library library (to detect changes) empty trash clean bundles (in menu next to server name, when accessed under ‘More’) double check naming schema and move files back scan the library Support articl…

…which you may need at some point - if renaming and refreshing doesn’t do the trick.