Bubbleupnp playlists - path problem?

[apogiffa]

A bit of a complex problem here.. I want to use playlists via bubbleupnp but the playlist files are always shown as empty.

I edited the m3u-playlists on my PC with Playlist Creator, in "settings" I have selected relative paths and forward slashes, as this was recommended in a thread regarding playlists in this forum. If I select the playlists in bubble, they are not playable and shown as empty.
The only playlists that work in bubble are those that I edit directly in the app, but it's a lot of work and once the IP address changes, they won't work anymore, as the IP address seems to be attached to those playlists.. those playlist files are .dpl
Instead I want to edit my playlists once on my PC, copy it to a folder on my NAS and be able to play them in the future.

My folder structure looks like this:
\\TS-253B\Multimedia\01. POP-ROCK-FOLK-ETC
\\TS-253B\Multimedia\02. ELECTRONIC
...
\\TS-253B\Multimedia\08. SAMPLER\-=EIGENE SAMPLER=-\PLAYLISTS\80s.m3u

The playlists are located in 08.SAMPLER\...\PLAYLISTS and contain files from the other folders 01., 02. etc.

I have attached a playlist that is shown as empty by bubbleupnp, maybe this helps to find the mistake I'm making.

My setup in case it's relevant:
QNAP NAS TS-253
Bubbleupnp 3.2.1
Minimserver 0.8.5.2

If anyone can help, I'd very glad. Thanks in advance!