I did a full wipe of Plex Server and re-installed. Still getting the same playback error, here are the log records that I believe reflect this issue:
Dec 28, 2017 13:59:17.635 [7836] DEBUG - Auth: authenticated user 1 as plxprem444
Dec 28, 2017 13:59:17.640 [7836] DEBUG - We’re going to try to auto-select an audio stream for account 1.
Dec 28, 2017 13:59:17.640 [7836] DEBUG - Selecting best audio stream for part ID 1 (autoselect: 0 language: en)
Dec 28, 2017 13:59:17.640 [7836] DEBUG - Audio Stream: 194, Subtitle Stream: -1
Dec 28, 2017 13:59:17.642 [7836] DEBUG - Codecs: testing aac_mf (encoder)
Dec 28, 2017 13:59:17.642 [7836] DEBUG - MDE: Selected protocol dash; container: mp4
Dec 28, 2017 13:59:17.643 [7836] DEBUG - MDE: analyzing media item 1
Dec 28, 2017 13:59:17.643 [7836] DEBUG - MDE: Atomic Blonde (2017): Direct Play is disabled
Dec 28, 2017 13:59:17.643 [7836] DEBUG - MDE: Atomic Blonde (2017): media must be transcoded in order to use the dash protocol
Dec 28, 2017 13:59:17.643 [7836] DEBUG - MDE: Atomic Blonde (2017): no direct play video profile exists for http/mkv/h264
Dec 28, 2017 13:59:17.643 [7836] DEBUG - MDE: Atomic Blonde (2017): no direct play video profile exists for http/mkv/h264/dca
Dec 28, 2017 13:59:17.643 [7836] DEBUG - MDE: Atomic Blonde (2017): no direct play video profile exists for http/mkv/h264/dca
Dec 28, 2017 13:59:17.643 [7836] DEBUG - MDE: Atomic Blonde (2017): no direct play video profile exists for http/mkv/h264/dca
Dec 28, 2017 13:59:17.644 [7836] DEBUG - Codecs: testing aac_mf (encoder)
Dec 28, 2017 13:59:17.645 [7836] DEBUG - MDE: Atomic Blonde (2017): selected media 0 / 1
Dec 28, 2017 13:59:17.646 [7836] DEBUG - Streaming Resource: Reached Decision id=2 codes=(General=1001,Direct play not available; Conversion OK. Direct Play=3000,App cannot direct play this item. Direct play is disabled. Transcode=1001,Direct play not available; Conversion OK.) media=(id=1 part=(id=1 decision=transcode container=mp4 protocol=dash streams=(Video=(id=193 decision=copy width=1920 height=1080) Audio=(id=194 decision=transcode bitrate=256 encoder=aac_mf channels=2 rate=48000))))
Dec 28, 2017 13:59:17.649 [11284] DEBUG - Completed: [127.0.0.1:59471] 200 GET /video/:/transcode/universal/decision?hasMDE=1&path=%2Flibrary%2Fmetadata%2F2&mediaIndex=0&partIndex=0&protocol=dash&fastSeek=1&directPlay=0&directStream=1&subtitleSize=100&audioBoost=100&location=lan&addDebugOverlay=0&autoAdjustQuality=1&directStreamAudio=1&session=9xdijw6vz4o5ajxvqqgj6hf9&subtitles=burn&Accept-Language=en (11 live) GZIP 15ms 3078 bytes (pipelined: 2)
Dec 28, 2017 13:59:17.692 [11284] DEBUG - Auth: authenticated user 1 as plxprem444
Dec 28, 2017 13:59:17.693 [6244] DEBUG - Request: [127.0.0.1:59471 (Loopback)] GET /status/sessions (11 live) GZIP Signed-in Token (plxprem444)
Dec 28, 2017 13:59:17.824 [11540] DEBUG - [Now] User is plxprem444 (ID: 1)
Dec 28, 2017 13:59:17.825 [11540] DEBUG - [Now] Device is Chrome (Plex Web (Chrome)).
Dec 28, 2017 13:59:17.825 [11540] DEBUG - [Now] Profile is Web
Dec 28, 2017 13:59:17.825 [11540] DEBUG - [Now] Updated play state for /library/metadata/2.
Dec 28, 2017 13:59:17.825 [11540] DEBUG - Statistics: (2yx75uwyvzbsaui5lzbg32bs) Reporting active playback in state 1 of type 1 (scrobble: 0) for account 1
Dec 28, 2017 13:59:17.825 [6244] DEBUG - [Now] Adding 1 sessions.
Dec 28, 2017 13:59:17.826 [11284] DEBUG - Completed: [127.0.0.1:59470] 200 GET /:/timeline?ratingKey=2&key=%2Flibrary%2Fmetadata%2F2&playQueueItemID=1&state=playing&hasMDE=1 (11 live) GZIP 375ms 638 bytes (pipelined: 1)
Dec 28, 2017 13:59:17.826 [11284] DEBUG - Completed: [127.0.0.1:59472] 200 GET /:/timeline?ratingKey=2&key=%2Flibrary%2Fmetadata%2F2&playQueueItemID=1&state=paused&hasMDE=1 (11 live) GZIP 374ms 638 bytes (pipelined: 1)
Dec 28, 2017 13:59:17.828 [11284] DEBUG - Auth: authenticated user 1 as plxprem444
Dec 28, 2017 13:59:17.828 [11284] DEBUG - Completed: [127.0.0.1:59471] 200 GET /status/sessions (11 live) GZIP 135ms 3311 bytes (pipelined: 3)
Dec 28, 2017 13:59:17.829 [7836] DEBUG - Request: [127.0.0.1:59470 (Loopback)] GET /video/:/transcode/universal/start.mpd?hasMDE=1&path=%2Flibrary%2Fmetadata%2F2&mediaIndex=0&partIndex=0&protocol=dash&fastSeek=1&directPlay=0&directStream=1&subtitleSize=100&audioBoost=100&location=lan&addDebugOverlay=0&autoAdjustQuality=1&directStreamAudio=1&session=9xdijw6vz4o5ajxvqqgj6hf9&subtitles=burn&Accept-Language=en (11 live) GZIP Signed-in Token (plxprem444)
Dec 28, 2017 13:59:17.829 [7836] DEBUG - Found session GUID of 9xdijw6vz4o5ajxvqqgj6hf9 in session start.
Dec 28, 2017 13:59:17.830 [7836] DEBUG - TranscodeUniversalRequest: using profile Web
Dec 28, 2017 13:59:17.831 [7836] DEBUG - Downloading document http://127.0.0.1:32400/library/metadata/2?checkFiles=1&includeBandwidths=1&offset=-1&X-Plex-Session-Identifier=f6i1alia41r6tygq4njy5tq2
Dec 28, 2017 13:59:17.831 [7836] DEBUG - Auth: authenticated user 1 as plxprem444
Dec 28, 2017 13:59:17.833 [6376] DEBUG - HTTP 429 response from GET https://plex.tv/api/codecs/h264_decoder?build=windows-i386&deviceId=e42073bd-b1ec-4c5a-a298-c1b223ab5c3e&oldestPreviousVersion=1.10.1.4602-f54242b6b&version=b077134-1269
Dec 28, 2017 13:59:17.833 [6376] ERROR - Codecs: Failed to download XML for codec ‘h264_decoder’
Dec 28, 2017 13:59:17.833 [6376] ERROR - Error configuring transcoder: Decoder install failed: h264
Dec 28, 2017 13:59:17.833 [6376] DEBUG - Streaming Resource: Terminated session 0AB4C9C8:f6i1alia41r6tygq4njy5tq2 with reason Conversion failed. A required codec could not be found or failed to install.
Dec 28, 2017 13:59:17.833 [3392] DEBUG - Killing job.
It appears to be a codec issue, any ideas on how to fix this?