My TV have always newest firmware. Currently version 05.00.10 (auto-update) Unfortunately, there is no indication when the update was made.
Synology NAS have newest updates, Fritzbox 7590 media server have newest update, Windows 10 DLNA server is up-to-date.
I have this tv nearly 8 months and DLNA always working without any issues. I have since few days this same issue with all 3 independent DLNA servers. So must be a problem with LG TV ( webOS).
And browsing in music its working, only the second option to browse image+video failes with black screen.