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Probably your MusicBeeSettings.ini file got corrupted. This is why you should backup your library occasionally!http://musicbee.wikia.com/wiki/Backup_%26_RestoreHowever, for a more helpful solution to your present problem, try to restore a previous version of your settings file (and probably StartupSettings.ini, too) in Windows Explorer (right click on file > Properties > Previous Versions). My settings file got borked a couple of days ago, and I was able to fix it that way.