Yeah, that's number 4 in my list. How many tracks are in your root playlist?

Is it possible that you have multiple trees in the playlist that point to the same songs, and you haven't ignore-as-childed some of them?

For example, do you have one playlist called "artists", and one playlist called "albums", both in the root, and they all link the same songs? That would make your root playlist twice the size of the total number of songs on your player. In that example, to solve the problem, simply tag one of those two playlists with the "ignore as child" tag.

What is the total number of songs in your player?

NOTE: Number 1 in my list still might apply. I was getting that problem before, and it only happened when I tried to initiate a large playlist. Small playlists wouldn't run up against the corruption on my scratch partition, only large ones would.

DO NOT TRY THE MAXFID PATCH until you have tried doing the repair steps I linked in number 1 above.