Came across this error earlier while using the thumb browser.
I guess it didn't like me removing the contents of a category while it was still open.
MusicBee v3.0.5883.37616 (Win10.0), 11 Feb 2016 15:18:
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at MusicBee.MusicBeeMain.#=qkhbaEWAWFyyyjar$78lrUpgiSq3H7$KYZ1IsHPywSqA=.#=qYuOtCKCfp$IjZqMAppwr3aRUjNZ9C_6YTjfAtCfyZY4=.#=q0QuPbqmoE7cLcfmmsOT3jgkqLdGj6M2wcmlEEZEyHJ0=._Lambda$__0(Graphics #=qW1PovF$bjyzpuVO5MS32Aw==)
at #=qKL8uQ2FznFN6qRPl1lE5tg==.#=qWZzBgn4FwBhFCEPHOBOc7g==.#=q3NGwkVrYUKJfQqh25nARTQ==(#=qgxDRoRtfOk0WP1MLBZRyeXxK0mkpudAnBqgVLuoJiz4= #=qfqqaUFyQ$aH2Wus2V6khJA==)
at #=qKL8uQ2FznFN6qRPl1lE5tg==.#=qwPa3kS0Xxd7RgszkWY490YHjeiItNfjwgdB6OEdvx6Y=.#=qSwj6G_PpW$8vqY6TLC0hkA==(#=qgxDRoRtfOk0WP1MLBZRyeXxK0mkpudAnBqgVLuoJiz4= #=q4llz5p9FdHVgP3TcLtaNmg==)
at MusicBee.MusicBeeMain.#=qkhbaEWAWFyyyjar$78lrUpgiSq3H7$KYZ1IsHPywSqA=.#=qYuOtCKCfp$IjZqMAppwr3aRUjNZ9C_6YTjfAtCfyZY4=.#=qOcSm1A4v4lnj58$dVSr$lc99zaWMCqTHnlE6bWGPZd4=(Int32 #=q0V5z76j0dtXxUqAhFciTyw==, #=qK6f3uSMWjfSMBJtP66_dkA== #=qKh3p3y_ad5SmMbWYqSpa9A==)
at MusicBee.MusicBeeMain.#=qkhbaEWAWFyyyjar$78lrUpgiSq3H7$KYZ1IsHPywSqA=.#=qYuOtCKCfp$IjZqMAppwr3aRUjNZ9C_6YTjfAtCfyZY4=.#=qRB45oTPZopi5w2rAMTDZMA==(Graphics #=qFC4lwHUud6uS3EcxoPUE1A==, Rectangle #=quOUmmTjkKZc6WwIGpy66TQ==)
at MusicBee.MusicBeeMain.#=qkhbaEWAWFyyyjar$78lrUpgiSq3H7$KYZ1IsHPywSqA=.#=qYuOtCKCfp$IjZqMAppwr3aRUjNZ9C_6YTjfAtCfyZY4=.OnPaint(PaintEventArgs #=qOkRe3CmVh81Nq70g3DRZAg==)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at #=qt1YGVVGuOd1qJvhqDi$G8vUlbU2v9THjuN8X$SZXgWU=.WndProc(Message& #=qvPm8Yx7oMrm1Gi94l_Sx5w==)
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)