I recently bought a Plex Pass for the mobile sync feature but it has only been working with my movies and music but not with my TV shows. The problem herein arises when Plex goes to transcode the media in any way. These TV shows used to play beautifully, but recent updates have rendered them unplayable in Plex (yet they play fine in VLC.) Some TV shows transcode fine, and some refuse to play or sync, a.k.a. the obscure "The transcoder was unable to process this media." error and when playing "The transcoder crashed or failed to start..." error.
I am on the latest version of Plex (Version 126.96.36.19909 at the time of writing) and the latest version of macOS (Version 10.12.6 (16G29) at the time of writing). Some TV shows do work, so at first I suspected it was an issue loading the font for the subtitles, but the crash report from the Plex Transcoder indicates that it was some sort of memory corruption issue. It was under my impression that this was fixed for 1.8.0, and I see no details about it in the log besides the Job Handler stating that the transcoder quit because of signal 11.
Here is a relevant excerpt of the crash report:
Process: Plex Transcoder 
Path: /Applications/Plex Media Server.app/Contents/MacOS/Plex Transcoder
Identifier: Plex Transcoder
Code Type: X86-64 (Native)
Parent Process: Plex Media Server 
Responsible: Plex Transcoder 
User ID: 501
Date/Time: 2017-08-13 21:03:55.991 -0400
OS Version: Mac OS X 10.12.6 (16G29)
Report Version: 12
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler 
Just for laughs, I booted up Plex Server Version 0.9.8.6 and the TV show played beautifully (even though the Flash Player was a bit crappy.) I'm not sure what has happened between these two, but there have been changes made to the transcoder that obviously have been detrimental. I wanted to try a version after 188.8.131.52, but alas, there seem to be no archive for downloads, which I think is unfortunate at the least, especially because that makes it impossible to pinpoint exactly where it went wrong. Maybe the file is not being loaded correctly? I can watch it convert about 7% of the way in and then it just crashes. I have plenty of free space (20+ GB on my main drive and 91+ GB on my external drive) so memory, RAM (16GB) and computing resources (2.9 GHz i7) don't seem to be a problem.
Any help is appreciated, especially if someone could point me towards a version of Plex a few versions back (but not quite as old as pre-1.0.) I'm really scratching my head here... the Plex Dance has failed me.