Dude, you saved me. After the latest NVIDIA update (which caused a variety of issues), I finally got the Shield itself working after a factory reset… But the Plex would not add ANY of my media from my external hard drives.
Turning off the debug logging (which had set itself to “On”) on the Plex Media Server seems to have fixed it. It’s now seeing and scanning all my media into the library.
Fingers crossed everything else works ok, but THANK YOU!!!
P.S. - Here’s a link to my original Plex forums post: Plex on Shield TV Completely Broken