DLNA streamed media not marked as played anymore and stream status no longer shown. (Server Version#: 1.13.9.5439)

Same problem reported here - Bug Report: DLNA Client NOT Updated AT ALL! On Deck, Now Playing, Recently Viewed ...(WDTV Live) - updated w Logs and downgrade works

Downgrading to the last working version 1.13.8.5395 is possible by uninstalling Plex Server then installing the older version. See How do I revert to a previous version of plex.