Image distorted when selecting subtitles

Did you restart PMS after deleting the driver?

I’m running 1.18.4.2171 on a DS918+ and transcoding works with the driver deleted.

Maybe try the following:

  1. Via the Package Center, stop and remove PMS.
  2. Download the latest version from https://www.plex.tv/media-server-downloads/#plex-media-server.
  3. Install, but do not start, latest version via Package Center.
  4. Delete the offending driver (instructions).
  5. Via the Package Center, start PMS.