If other suggestions don’t' work then

are you always starting up Song Picker in the same DIRECTORY (probably, but not necessarily, D:\BB?).
Also Is there a " SongListTemp4.BIN" in your D:\BB directory, that is the actual file built and written to when Song Picker creates a new list for that particular directory - also that file should have a date/time stamp of last time you BUILT it . Symptoms sound like BIAB can’t FIND the .bin file so it thinks it needs rebuilt for that directory .

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Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20