[MonoDevelop] Can't start MD

[Abe Gillespie]

I'm on Ubuntu Dapper Beta 2.  I've compiled all Mono, necessary
dependencies, and MD from the latest source releases.  First I have to
set MOZILLA_FIVE_HOME since the monodevelop script apparently isn't
finding it:

export MOZILLA_FIVE_HOME=/usr/lib/mozilla-firefox/

Then I run monodevelop.  The splash screen comes up and gets to
"Loading Workbench" (I think, it dies quickly thereafter) and display
this error info:

(MonoDevelop:3752): Gdk-CRITICAL **: gdk_window_move_resize: assertion
`GDK_IS_WINDOW (window)' failed
System.NullReferenceException: Object reference not set to an instance
of an object
in <0x00096> Gdl.DockItem:OnSizeAllocated (Rectangle allocation)
in <0x0007f> Gtk.Widget:sizeallocated_cb (IntPtr widget, Gdk.Rectangle
allocation)
in (wrapper native-to-managed) Gtk.Widget:sizeallocated_cb
(intptr,Gdk.Rectangle&)
in <0x00000> <unknown method>
in (wrapper managed-to-native) Gtk.Widget:gtk_widget_size_allocate
(intptr,Gdk.Rectangle&)
in <0x00027> Gtk.Widget:SizeAllocate (Rectangle allocation)
in <0x00109> Gdl.Dock:OnSizeAllocated (Rectangle allocation)
in <0x0007f> Gtk.Widget:sizeallocated_cb (IntPtr widget, Gdk.Rectangle
allocation)
in (wrapper native-to-managed) Gtk.Widget:sizeallocated_cb
(intptr,Gdk.Rectangle&)
in <0x00000> <unknown method>
in (wrapper managed-to-native) Gtk.Dialog:gtk_dialog_run (intptr)
in <0x00031> Gtk.Dialog:Run ()
in <0x0002a> MonoDevelop.Core.Gui.Dialogs.ErrorDialog:Run ()
in <0x00d20> MonoDevelop.Ide.Gui.IdeStartup:Run (System.String[] args)
in <0x0020e> MonoDevelop.Core.AddIns.AddInService:StartApplication
(System.String addinId, System.String[] parameters)

Thanks for any help.
-Abe