PMS Crashing when playing video from iPad

For some reason, PMS 0.9.16.6 (OSX 10.11.5) is now crashing when I try to play videos from my iPad, using either the iOS app or the web interface. I can browse just fine using either method, and using OpenPHT on another mac or using the web interface on the server itself, I am able to play videos.

There are no logs here:
~/Library/Application Support/Plex Media Server/Crash Reports/
~/Library/Logs/CrashReporter/

I did find logs under ~/Library/Logs/DiagnosticReports and under ~/Library/Logs/Plex Media Server

Any ideas?