I have no issue with the 65k track constraint with some 12k tracks in my NAS, but I am always hitting the constraint on the number of playlists/tracks contained.
I often get an unable to add to playlist message, followed by a message telling me I have too many. When I delete one, I am able to proceed.
What is the formal limit, and is there one on playlists as well as tracks in them separately? Where does one keep track of this in the Matrix call up?