shaka4011 (Manifest) error

I’m currently getting the following error message when trying to use the Plex Media Player or chromium when trying to view a video or listen to music:
shaka4011 (Manifest)
Current versions
Plex Media Player - 2.1.1
Plex Media Server - 1.9.2.4285
This issue is only occuring on computers that have Plex Media Player / chromium. The computer that has Plex Media Server and Plex Media Player / chromium doesn’t have the error and performs as expected.

I have this error as well. In my case, I have a client machine running Fedora 26 and using Firefox 56 (64-bit).

Any suggestions?