I have noticed a major bug with 1.7.4; if two files of the same type (e.g. MP3) and the same Title/Artist--but different bitrates/encoding parameters--are played, the same spectrogram produced for the first one played will not change for the second one, even though the actual graph should be obviously different (and displays so in Spek).
MusicBee 3.4.7601, Windows 10 v2004 64-bit, ffmpeg 4.3.1 64-bit.
FWIW in Properties/Details of mb_Spectrogram-Display.dll, the version still says "1.7.2" instead of 1.7.4, mod date is 3/20/2020.