In reply to:

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40k on the server side; 10k ont he client side; I would imagine that this number can be lower if you have long descriptions/id3 v2/etc.. For me the limit was around 4k..

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I got my setup working by splitting my 4502 tracks into 4 playlists of about 1100 tracks each. I call the playlists A-C, C-J, etc. Now I can play randomly within 1/4 of my collection at a time.

So with my particular ID3 tags (fed directly by freedb at the time of ripping), the limit is somewhere between 1100 and 4502.

I tried splitting into two playlists of just over 2200 tracks each, but the ARM (server) software crashed every time I asked it to read in those two playlists.

P.S.: As a side effect, these 4 playlists put the tracks in the "correct" order. That is, artists/albums are listed alphabetically, while the tracks are by original track# order. That's how I arranged the playlist in WinAmp. So now when I want to play an album in its original order, it is easy to do so.