Updated Banshee to the latest from supplementary/GNOME, and it now crashes just after drawing the main window with the following output:

ogley@riggwelter:~> banshee
0: Active Player Engine is now 'Helix'
1: Loaded PlayerEngine core: Helix
2: Loaded AudioCdPlayerEngine core: GStreamer
3: Audio CD Core Initialized
4: Registered Banshee.SqlLoadTransaction
5: Executing Banshee.SqlLoadTransaction

(Banshee:8212): Gdk-WARNING **: Using Cairo rendering requires the drawable argument to
have a specified colormap. All windows have a colormap,
however, pixmaps only have colormap by default if they
were created with a non-NULL window argument. Otherwise
a colormap must be set on them with gdk_drawable_set_colormap
System.NullReferenceException: Object reference not set to an instance of an object
in <0x00000> <unknown method>
in (wrapper managed-to-native) Gtk.Application:gtk_main ()
in <0x00007> Gtk.Application:Run ()
in [0x001a5] (at /usr/src/packages/BUILD/banshee-0.9.10/src/PlayerInterface.cs:162) Banshee.PlayerUI:.ctor ()
in [0x0071f] (at /usr/src/packages/BUILD/banshee-0.9.10/src/Main.cs:222) Banshee.BansheeEntry:Startup (System.String[] args)
in [0x00001] (at /usr/src/packages/BUILD/banshee-0.9.10/src/Main.cs:41) Banshee.BansheeEntry:Main (System.String[] args)

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
in <0x00000> <unknown method>
in (wrapper managed-to-native) Gtk.Dialog:gtk_dialog_run (intptr)
in <0x0001d> Gtk.Dialog:Run ()
in [0x00024] (at /usr/src/packages/BUILD/banshee-0.9.10/src/Main.cs:46) Banshee.BansheeEntry:Main (System.String[] args)
ogley@riggwelter:~>