Just an isolated observation and tip for people using AutoHotKey to start MusicBee:
If you have configured an AHK key combination to launch MusicBee, and your shortcut combination of choice contains the [Shift] key:
Depending on how fast (or how slow) your fingers are, there is a chance that MusicBee will open presenting a 'choose library' window instead of just starting.
In that case just add a little pause to the AHK script that waits a short while before launching MusicBee, so that you have time to release the shortcut keys before it does.
E.g. adding 'Sleep 1000' will give you a full second to lift your fingers after pressing [Ctrl]+[Shift]+[F11]:
Run "C:\Program Files (x86)\MusicBee\MusicBee.exe"