Hi, everyone!
I already did have this problem and have had it resolved. But it was a long time ago and I don't remeber how, shame on me.
Long story short, PMS installing ok, but Media Scanner won't add any files to the Libraries. I remember only that the whole thing has to do something with user permissions and I did managed it once for sure.
The control panel on the TOS (the NAS operating system), show no user named "plex", but there is a folder "plex" in the "user" category and i can't create a new user named "plex". But I can rename any other user to "plex".
In the logs Media Scanner keeps referring to the address http://127.0.0.1:32400/, which seems odd to me, and keeps getting an error 401.
DLNA server btw refers to the right local address like 192.168.1.13 and seems to be ok.
I will try to remember what moves I've done last time and if I'll do it again, will post here.
But I also appreciate any help!