Nvidia Plex Media Server PMS With Roku Client Playback Error

PMS version?

If 1.41.7.xxxx, update to 1.41.7.9823 if available for the Shield (release notes).

For Roku clients, Plex transcodes some audio formats to EAC3. Earlier 1.41.7.x releases have a bug where transcoding fails. The bug is fixed in 1.41.7.9823.