Finally caught it today on banshee 2.2.1. Was listening to a few songs when it crashed completely without warning.

ant@Master-Ant:~$ banshee
[Info  15:19:20.932] Running Banshee 2.2.1: [Ubuntu 11.10 (linux-gnu, x86_64) @ 2011-11-22 12:10:01 UTC]
[Info  15:19:22.348] Updating web proxy from GConf
[Info  15:19:22.468] All services are started 1.231323
[Info  15:19:24.045] nereid Client Started
[Info  15:19:24.173] GStreamer version 0.10.35.0, gapless: True, replaygain: False

Unhandled Exception: System.ObjectDisposedException: The object was used after being disposed.
at System.Threading.WaitHandle.CheckDisposed () <0x0004f>
at System.Threading.EventWaitHandle.Set () <0x0000f>
at (wrapper remoting-invoke-with-check) System.Threading.EventWaitHandle.Set () <0x00053>
at Hyena.Data.Sqlite.HyenaSqliteCommand.WaitForResult (Hyena.Data.Sqlite.HyenaSqliteConnection) <0x00067>
at Hyena.Data.Sqlite.HyenaSqliteConnection.Execute (Hyena.Data.Sqlite.HyenaSqliteCommand) <0x00037>
at Hyena.Data.Sqlite.HyenaSqliteConnection.Execute (string,object[]) <0x00053>
at Banshee.SmartPlaylist.SmartPlaylistSource.Refresh () <0x0025b>
at Banshee.SmartPlaylist.SmartPlaylistSource.RefreshAndReload () <0x0000f>
at Banshee.SmartPlaylist.SmartPlaylistSource.HandleTracksChanged (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x0008b>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x0005e>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at Banshee.Sources.PrimarySource/<OnTracksChanged>c__AnonStorey24.<>m__46 () <0x000a4>
at Hyena.ThreadAssist.SpawnFromMain (System.Threading.ThreadStart) <0x0002c>
at Banshee.Sources.PrimarySource.OnTracksChanged (Hyena.Query.QueryField[]) <0x0006f>
at Banshee.Sources.PrimarySource.NotifyTracksChanged (Hyena.Query.QueryField[]) <0x00018>
at Banshee.Collection.Database.DatabaseTrackInfo.Save (bool,Hyena.Query.QueryField[]) <0x00257>
at Banshee.Collection.Database.DatabaseTrackInfo.UpdateLastPlayed () <0x00073>
at Banshee.GStreamer.PlayerEngine.OnAboutToFinish (intptr) <0x0001a>
at (wrapper native-to-managed) Banshee.GStreamer.PlayerEngine.OnAboutToFinish (intptr) <0x0006f>

[ERROR] FATAL UNHANDLED EXCEPTION: System.ObjectDisposedException: The object was used after being disposed.
at System.Threading.WaitHandle.CheckDisposed () <0x0004f>
at System.Threading.EventWaitHandle.Set () <0x0000f>
at (wrapper remoting-invoke-with-check) System.Threading.EventWaitHandle.Set () <0x00053>
at Hyena.Data.Sqlite.HyenaSqliteCommand.WaitForResult (Hyena.Data.Sqlite.HyenaSqliteConnection) <0x00067>
at Hyena.Data.Sqlite.HyenaSqliteConnection.Execute (Hyena.Data.Sqlite.HyenaSqliteCommand) <0x00037>
at Hyena.Data.Sqlite.HyenaSqliteConnection.Execute (string,object[]) <0x00053>
at Banshee.SmartPlaylist.SmartPlaylistSource.Refresh () <0x0025b>
at Banshee.SmartPlaylist.SmartPlaylistSource.RefreshAndReload () <0x0000f>
at Banshee.SmartPlaylist.SmartPlaylistSource.HandleTracksChanged (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x0008b>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x0005e>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at (wrapper delegate-invoke) <Module>.invoke_void__this___Source_TrackEventArgs (Banshee.Sources.Source,Banshee.Sources.TrackEventArgs) <0x00095>
at Banshee.Sources.PrimarySource/<OnTracksChanged>c__AnonStorey24.<>m__46 () <0x000a4>
at Hyena.ThreadAssist.SpawnFromMain (System.Threading.ThreadStart) <0x0002c>
at Banshee.Sources.PrimarySource.OnTracksChanged (Hyena.Query.QueryField[]) <0x0006f>
at Banshee.Sources.PrimarySource.NotifyTracksChanged (Hyena.Query.QueryField[]) <0x00018>
at Banshee.Collection.Database.DatabaseTrackInfo.Save (bool,Hyena.Query.QueryField[]) <0x00257>
at Banshee.Collection.Database.DatabaseTrackInfo.UpdateLastPlayed () <0x00073>
at Banshee.GStreamer.PlayerEngine.OnAboutToFinish (intptr) <0x0001a>
at (wrapper native-to-managed) Banshee.GStreamer.PlayerEngine.OnAboutToFinish (intptr) <0x0006f>