This is a known bug in the current version of the server software. It is the number one item on their priority list for the next software release.
I don't know exactly how many tracks the limitation is. It might vary depending on the data contained in the track tags.
There are some third-party pieces of server sofware linked in the FAQ section of this BBS. I do not know if they have already worked around this bug or not, but you might want to give them a try and see if they give you better results.
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Tony Fabris