Can't run banshee on my fresh Ubuntu Gutsy install (powerpc G4). The splash starts and when it says "Loading user interface", banshee gets a SIGSEGV.

Follows the gdb trace (warning, long log):
GNU gdb 6.6-debian
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This GDB was configured as "powerpc-linux-gnu"...
(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
Starting program: /usr/bin/mono --debug /usr/lib/banshee/banshee.exe
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 805502976 (LWP 32410)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[New Thread 815609008 (LWP 32413)]
[New Thread 816854192 (LWP 32414)]
[New Thread 840271024 (LWP 32416)]
Debug: [20/10/2007 0:06:06] (Loading audio profiles) - /usr/share/banshee/audio-profiles
[New Thread 848753840 (LWP 32417)]
[New Thread 857142448 (LWP 32418)]
[Thread 857142448 (LWP 32418) exited]
[Thread 848753840 (LWP 32417) exited]
[New Thread 858256560 (LWP 32419)]
[New Thread 860087472 (LWP 32420)]
Debug: [20/10/2007 0:06:10] (Motor de reproducción predeterminado) - GStreamer 0.10
Debug: [20/10/2007 0:06:10] (Inicializado el core de CD de audio) - 
Debug: [20/10/2007 0:06:10] (Testing device for DAP support) - /org/freedesktop/Hal/devices/volume_uuid_e80675dc_52e0_4ad0_92f1_d3b5457bd5ab
[Thread 858256560 (LWP 32419) exited]
Debug: [20/10/2007 0:06:10] (DAP has not been added) - /org/freedesktop/Hal/devices/volume_uuid_e80675dc_52e0_4ad0_92f1_d3b5457bd5ab
Debug: [20/10/2007 0:06:10] (Testing device for DAP support) - /org/freedesktop/Hal/devices/volume_uuid_470F_ECF3
Debug: [20/10/2007 0:06:10] (DAP has not been added) - /org/freedesktop/Hal/devices/volume_uuid_470F_ECF3
Warning: [20/10/2007 0:06:11] (Power Management Call Failed) - Cannot find GNOME Power Manager: Name org.gnome.PowerManager has no owner
Debug: [20/10/2007 0:06:11] (Enabled multimedia keys support) - Using org.gnome.SettingsDaemon

(Banshee:32410): GLib-GObject-WARNING **: cannot retrieve class for invalid (unclassed) type `(null)'
Stacktrace:

  at (wrapper managed-to-native) Gtk.CellRenderer.gtksharp_cellrenderer_override_get_size (GLib.GType,Gtk.CellRenderer/GetSizeDelegate) <0xffffffff>
  at (wrapper managed-to-native) Gtk.CellRenderer.gtksharp_cellrenderer_override_get_size (GLib.GType,Gtk.CellRenderer/GetSizeDelegate) <0x0009c>
  at Gtk.CellRenderer.OverrideGetSize (GLib.GType) <0x000ac>
  at (wrapper runtime-invoke) Gtk.Widget.runtime_invoke_void_GType (object,intptr,intptr,intptr) <0x00090>
  at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke (object,object[]) <0xffffffff>
  at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke (object,object[]) <0x00098>
  at System.Reflection.MonoMethod.Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo) <0x00130>
  at System.Reflection.MethodBase.Invoke (object,object[]) <0x00040>
  at GLib.Object.ConnectDefaultHandlers (GLib.GType,System.Type) <0x00278>
  at GLib.Object.RegisterGType (System.Type) <0x0014c>
  at GLib.Object.LookupGType (System.Type) <0x0016c>
  at GLib.Object.LookupGType () <0x00034>
  at GLib.Object.CreateNativeObject (string[],GLib.Value[]) <0x00124>
  at Gtk.Object.CreateNativeObject (string[],GLib.Value[]) <0x00030>
  at Gtk.CellRendererText..ctor () <0x000ac>
  at Banshee.Gui.SourceRowRenderer..ctor () <0x00020>
  at Banshee.Gui.SourceView..ctor () <0x001c0>
  at Banshee.PlayerUI.BuildWindow () [0x0075c] in /build/buildd/banshee-0.13.1+dfsg/src/Core/Banshee/PlayerInterface.cs:380
  at Banshee.PlayerUI..ctor () <0x0016c>
  at <>c__CompilerGenerated0.<>c__AnonymousMethod17 () [0x00005] in /build/buildd/banshee-0.13.1+dfsg/src/Core/Banshee/Main.cs:115
  at (wrapper delegate-invoke) System.MulticastDelegate.invoke_void () <0x00064>
  at Banshee.Base.ComponentInitializer.Run () [0x00057] in /build/buildd/banshee-0.13.1+dfsg/src/Core/Banshee.Base/ComponentInitializer.cs:127
  at Banshee.Base.Globals.Initialize (Banshee.Base.ComponentInitializerHandler) [0x00343] in /build/buildd/banshee-0.13.1+dfsg/src/Core/Banshee.Base/Globals.cs:198
  at Banshee.BansheeEntry.Startup (string[]) [0x0029c] in /build/buildd/banshee-0.13.1+dfsg/src/Core/Banshee/Main.cs:113
  at (wrapper delegate-invoke) System.MulticastDelegate.invoke_void_string[] (string[]) <0x00088>
  at Banshee.Gui.CleanRoomStartup.Startup (Banshee.Gui.CleanRoomStartup/StartupInvocationHandler,string[]) [0x00045] in /build/buildd/banshee-0.13.1+dfsg/src/Core/Banshee.Base/Gui/CleanRoomStartup.cs:54
  at Banshee.BansheeEntry.Main (string[]) [0x00000] in /build/buildd/banshee-0.13.1+dfsg/src/Core/Banshee/Main.cs:43
  at (wrapper runtime-invoke) System.Object.runtime_invoke_void_string[] (object,intptr,intptr,intptr) <0x00080>

Native stacktrace:

	/usr/bin/mono [0x10166c58]
	/usr/bin/mono [0x10140494]
	[0x100350]
	/usr/lib/mono/gtk-sharp-2.0/libgtksharpglue-2.so(gtksharp_cellrenderer_override_get_size+0x54) [0xda41534]
	[0x3389ea98]
	[0x3389e900]
	[0x31d91404]
	/usr/bin/mono [0x101402bc]
	/usr/bin/mono(mono_runtime_invoke+0x1c) [0x10056478]
	/usr/bin/mono(mono_runtime_invoke_array+0x3dc) [0x1005d23c]
	/usr/bin/mono [0x100641dc]
	[0x31147de8]
	[0x3114785c]
	[0x31147714]
	[0x31d90a04]
	[0x31d8f7c0]
	[0x31d8f608]
	[0x31d8f478]
	[0x31d8f228]
	[0x31d8f0ec]
	[0x3389e520]
	[0x3389e434]
	[0x33814be4]
	[0x3378d8b4]
	[0x335d0b00]
	[0x335cde00]
	[0x31e0e970]
	[0x31e0dc04]
	[0x311494b8]
	[0x309e0c54]
	[0x309df8ac]
	[0x309df5b0]
	[0x309dd564]
	[0x309dd0dc]
	/usr/bin/mono [0x101402bc]
	/usr/bin/mono(mono_runtime_invoke+0x1c) [0x10056478]
	/usr/bin/mono(mono_runtime_exec_main+0x14c) [0x1005ba4c]
	/usr/bin/mono(mono_runtime_run_main+0x2a4) [0x1005bd40]
	/usr/bin/mono(mono_jit_exec+0xe0) [0x100134fc]
	/usr/bin/mono [0x10013638]
	/usr/bin/mono(mono_main+0x1714) [0x10014fe0]
	/usr/bin/mono [0x100120e4]
	/lib/libc.so.6 [0xfc34380]
	/lib/libc.so.6 [0xfc345c4]

Debug info from gdb:



=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.
=================================================================


Program received signal SIGABRT, Aborted.

+ Trace 171549