Spent a while (next to an hour) now, digging this forum to get an idea about the cifs error 13 and how to solve it.
If not all my other devices let it be windows, android, linux sat receivers would suffer the same I would assume a network problem, but since all these work like a charm and only the pi3 with runeaudio fails I wonder where to look now to get this solved.
Comments appreciated.
pi3 + latest runeos in combination with my syno nas with CIFS enabled doesn't work.