I tried double clicking on the Music node (because I won't open) in the left side bar, and got presented with this,
MusicBee v3.0.5785.39316 (Win6.3), 4 Nov 2015 6:58:
System.NullReferenceException: Object reference not set to an instance of an object.
at #=qxvnBjT$aLqmRRUig_COHyS7YseteRw5ALAacg4hcbpHEG6Y66W$vcw_NPB59pxF2.#=qWBAucRuSLtmIEQMpNfpJ5Q==(IList`1 #=qId727vgLiPzgjFEB2sf7GQ==, Int32 #=q76BYE8YEMcZNq9rYWHU$dg==)
at #=qxvnBjT$aLqmRRUig_COHyS7YseteRw5ALAacg4hcbpHEG6Y66W$vcw_NPB59pxF2..ctor(List`1 #=qjNPJFS4TWp9c_uOYN2BriQ==, Boolean #=qyS5VZ0qOTzcx71qaf30Obg==, #=qnUnKDwKlBo5UNcHnjbfVf0f3DGd5TLu7nZ$DoYr_7mc= #=qKuLHkZW1u_pd36JhOozdww==, Double #=q_NseBcpH33z7B_5QkarjsQ==, #=qIDoVH$fV$Xn2wwo0AioJI5o8adLO4KkYGEzpeGdNBLM= #=qw3bOLTrkcCwDH305$0FMVg==, #=q$LfFyjou25JlTCP2$T8iituPy5RUUzyj7DYkThUKir0= #=qmtPo$NE9G1eduxf5GY384A==)
at MusicBee.Media.PlayManager.#=q24rN42XtMpa8ElqZwfluFuTuvheHXP0E_M0fSTL5pMk=(List`1 #=qPmXi44AtTg0jhn0pYVyWcw==, #=quBTWLQEpz_JUjVbEDhFEctQwOG2OitHuzwxFzOvQKk0= #=qlLgSt0u3l3YK4$IAlAGZ0A==, #=qIDoVH$fV$Xn2wwo0AioJI5o8adLO4KkYGEzpeGdNBLM= #=q1gZMlAM5NUoBL88RnH5Ypw==, #=qDuvXZ3shsR4RLH_xkDyUf7Yv1S4haIn7Djn6RlcfU3A= #=qe8q2GpxMrzxZNxC1ZBZ$qg==)
at MusicBee.Media.PlayManager.#=qQubIA_H82pWbbOuQ8vwN$RQuRVP_1o1LesyzallPL2U=(#=q227F_UPm1pDHBE5q3XT2SxoMh_a2fvWacApvXNKsb5A= #=qE_wQD1mQzoNg9uWAqmQ8jQ==, #=qIDoVH$fV$Xn2wwo0AioJI5o8adLO4KkYGEzpeGdNBLM= #=qm$NnfS7x_TpPKs_u5kw1xw==)
at MusicBee.MusicBeeMain.#=qFNg2I$Mr5yfVqDV06712Pw==.#=qGTm3g3F_gqVxZ3kI11meg0Ml3QqI_9ZanTEMKAa8sXc=(#=q9OCAT_wceHX7Gm2oqBUUDzpF5w3v1tSrc65Z6f1xAuWgqL9nmaXZOjDUZvHowhMI #=qBOHAD3H3KQXxIOAwVUMqXA==)
at #=qyw8KZrIMIPOtc4BYKrLco7fdcXN9vPhAnZcm6qc3CK4=.OnMouseDoubleClick(MouseEventArgs #=q1CRxLM$dVwNhd_vjGt0ldg==)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at #=qGOQJqWbtwGLRdGoE_V2NYyHaVSOcgPgDiwI1F9CStSk=.WndProc(Message& #=qsoUNSDT3CzvT1$QM91ChnA==)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)