Cannot load subtitles from local network

[depesz]

I have Nexus 7 tables, and on it installed BSPlayer Free.

I use it to play video files that are served in my LAN using samba. Playback works just fine.

For some of the movies, BSPlayer can download subtitles from inernet, and it works, subtitles are displayed.
But whenever I tell it to load subtitles from samba share, it always ends with "Error loading subtitle."

I tried loading subtitles in various formats. I even fetched the subtitles BSPlayer downloaded from the internet (have url grabber on my router, so I had url, downloaded the subtitles, unpacked and renamed the file) - still result is the same.

What could be the problem? Should I install full BSPlayer, and it will make subtitles work, or if it should work in the free version too, how can I debug what is the problem?