As far as I can see, you get an error with ZLIB (your prev post). I have not heard anyone else reproducing your issue nor I cannot reproduce it on 3.0.1 nor 3.0.2. 3.0.3 is not available on OBS (so I cannot build the server) nor for Onyx (so I cannot test it). Thus, all I can do is to rely on others for testing. When you select default folder, does everything work? When you select some other folder, is its name shown correctly in Settings? I presume that you created a folder by file browser and then selected it in the server by holding for longer time the folder and pressing select then in context menu. Right? ZLIB error - does it come before you do anything or when you choose folder? PS: don't be sorry for trying to make it working
harbour-osmscout-server: /usr/share/harbour-osmscout-server/lib/libz.so.1: version `ZLIB_1.2.9' not found (required by /usr/lib/libpng16.so.16)