ReadyDLNA does not find all files (dirs, files missing)

I really need to get the DLNA shares working so that I can start using my RN 102 as intended to.
I logged in via SSH and did this:

$ find -name *dlna*
/lib/systemd/system/minidlna.service
/data/.apps/.readydlna

the app data is located in "/data/.apps/.readydlna"

$ ls -l /data/.apps/.readydlna
drwxr-xr-x 1 root root 16 Jul 27 16:50 art_cache
-rw-r--r-- 1 root root 100937728 Aug 3 21:27 files.db

"files.db" is an SQLite DB with the file structure.
I did a copy of it and opened the DB with SQLite Database Browser. In the Object table I then did a search for a photo I know doesn't show up - there is no entry for that file - which means the file has not been indexed into the database. No wonder it doesn't show up.

"/lib/systemd/system/minidlna.service" tells us where the executable is:

[Service]
ExecStart=/usr/sbin/minidlnad -S

So I executed:
$ /usr/sbin/minidlnad -h

Usage:
/usr/sbin/minidlnad [-d] [-v] [-f config_file] [-p port]
[-s serial] [-m model_number]
[-t notify_interval] [-P pid_filename]
[-u uid_to_run_as]
[-w url] [-R] [-V] [-h]

Notes:
Notify interval is in seconds. Default is 895 seconds.
Default pid file is /var/run/minidlna/minidlna.pid.
With -d minidlna will run in debug mode (not daemonize).
-w sets the presentation url. Default is http address on port 80
-h displays this text
-R forces a full rescan
-L do note create playlists
-S changes behaviour for systemd
-V print the version number

Here it's possible to force a rescan. So next I did:
$ systemctl stop minidlna
$ /usr/sbin/minidlnad -S -R

The "-R" is for rebuilding the DB.

The deamon then output:
minidlna.c:972: warn: Starting ReadyDLNA version 1.1.0.
minidlna.c:353: warn: Creating new database at /apps/.readydlna/files.db
minidlna.c:1012: warn: HTTP listening on port 8200
scanner.c:766: warn: Scanning /memories/Music finished (x files)!
scanner.c:690: warn: Scanning /memories/Photos
scanner.c:766: warn: Scanning /memories/Photos finished (x files)!
scanner.c:690: warn: Scanning /memories/Videos
scanner.c:690: warn: Scanning /memories/Videos
scanner.c:766: warn: Scanning /memories/Videos finished (x files)!
playlist.c:125: warn: Parsing playlists…
playlist.c:256: warn: Finished parsing playlists.

This took about 30 min to complete (about 60.000 files)
The DB file increased in size:

drwxr-xr-x 1 root root 16 Aug 3 22:27 art_cache
-rw-r--r-- 1 root root 105984000 Aug 3 22:54 files.db

.. and all the files that I was missing now appeared! :D
There's still a bug in there though.. the auto/rescan function does NOT work as it should. And the manual button makes absolutely no sense. At least write in the log that something is happening.