Hi,

The same is happening to me in quantal amd64.

$tomboy --debug
** Running Mono with --debug    **
[DEBUG 11:46:44.716] NoteManager created with note path "/home/alexandre/.local/share/tomboy".
[INFO 11:46:45.240] Initializing Mono.Addins
[DEBUG 11:46:45.301] AddinManager.OnAddinLoaded: Tomboy.Tomboy
[DEBUG 11:46:45.303] 	       Name: Tomboy.Tomboy,0.10
[DEBUG 11:46:45.303] 	Description: 
[DEBUG 11:46:45.303] 	  Namespace: Tomboy
[DEBUG 11:46:45.303] 	    Enabled: True
[DEBUG 11:46:45.303] 	       File: /usr/lib/tomboy/Tomboy.exe
[DEBUG 11:46:45.793] AddinManager.OnAddinLoaded: Tomboy.ExportToHtmlAddin
[DEBUG 11:46:45.793] 	       Name: Export to HTML
[DEBUG 11:46:45.793] 	Description: Exports individual notes to HTML.
[DEBUG 11:46:45.793] 	  Namespace: Tomboy
[DEBUG 11:46:45.793] 	    Enabled: True
[DEBUG 11:46:45.793] 	       File: /usr/lib/tomboy/addins/ExportToHtml.dll
[DEBUG 11:46:45.795] AddinManager.OnAddinLoaded: Tomboy.FileSystemSyncServiceAddin
[DEBUG 11:46:45.796] 	       Name: Local Directory Sync Service Add-in
[DEBUG 11:46:45.796] 	Description: Synchronize Tomboy Notes to a local file system path
[DEBUG 11:46:45.796] 	  Namespace: Tomboy
[DEBUG 11:46:45.796] 	    Enabled: True
[DEBUG 11:46:45.796] 	       File: /usr/lib/tomboy/addins/FileSystemSyncService.dll
[DEBUG 11:46:45.796] AddinManager.OnAddinLoaded: Tomboy.WebDavSyncServiceAddin
[DEBUG 11:46:45.796] 	       Name: WebDav Sync Service Add-in
[DEBUG 11:46:45.796] 	Description: Synchronize Tomboy Notes to a WebDav URL
[DEBUG 11:46:45.796] 	  Namespace: Tomboy
[DEBUG 11:46:45.796] 	    Enabled: True
[DEBUG 11:46:45.796] 	       File: /usr/lib/tomboy/addins/WebDavSyncService.dll
[DEBUG 11:46:45.798] Unable to locate 'gnomesu' in your PATH
[DEBUG 11:46:45.798] Using '/usr/bin/gksu' as GUI 'su' tool
[DEBUG 11:46:45.798] Successfully found all system tools
[DEBUG 11:46:45.798] Unable to locate 'wdfs' in your PATH
[DEBUG 11:46:45.798] AddinManager.OnAddinLoaded: Tomboy.WebSyncServiceAddin
[DEBUG 11:46:45.799] 	       Name: Web Sync Service Add-in
[DEBUG 11:46:45.799] 	Description: Synchronize Tomboy Notes with Tomboy Online and other compatible web services
[DEBUG 11:46:45.799] 	  Namespace: Tomboy
[DEBUG 11:46:45.799] 	    Enabled: True
[DEBUG 11:46:45.799] 	       File: /usr/lib/tomboy/addins/WebSyncServiceAddin.dll
[DEBUG 11:46:45.801] Loading notes
[DEBUG 11:46:45.917] AddinManager.OnAddinLoaded: Tomboy.BacklinksAddin
[DEBUG 11:46:45.917] 	       Name: Backlinks
[DEBUG 11:46:45.917] 	Description: See which notes link to the one you're currently viewing.
[DEBUG 11:46:45.917] 	  Namespace: Tomboy
[DEBUG 11:46:45.917] 	    Enabled: True
[DEBUG 11:46:45.917] 	       File: /usr/lib/tomboy/addins/Backlinks.dll
[DEBUG 11:46:45.918] AddinManager.OnAddinLoaded: Tomboy.PrintNotesAddin
[DEBUG 11:46:45.918] 	       Name: Printing Support
[DEBUG 11:46:45.918] 	Description: Allows you to print a note.
[DEBUG 11:46:45.918] 	  Namespace: Tomboy
[DEBUG 11:46:45.918] 	    Enabled: True
[DEBUG 11:46:45.918] 	       File: /usr/lib/tomboy/addins/PrintNotes.dll
[DEBUG 11:46:45.919] AddinManager.OnAddinLoaded: Tomboy.FixedWidthAddin
[DEBUG 11:46:45.919] 	       Name: Fixed Width
[DEBUG 11:46:45.919] 	Description: Adds fixed-width font style.
[DEBUG 11:46:45.919] 	  Namespace: Tomboy
[DEBUG 11:46:45.919] 	    Enabled: True
[DEBUG 11:46:45.919] 	       File: /usr/lib/tomboy/addins/FixedWidth.dll
[DEBUG 11:46:45.920] AddinManager.OnAddinLoaded: Tomboy.EvolutionAddin
[DEBUG 11:46:45.920] 	       Name: Evolution Mail Integration
[DEBUG 11:46:45.920] 	Description: Allows you to drag an email from Evolution into a Tomboy note.  The message subject is added as a link in the note with an envelope icon next to it.
[DEBUG 11:46:45.920] 	  Namespace: Tomboy
[DEBUG 11:46:45.920] 	    Enabled: True
[DEBUG 11:46:45.920] 	       File: /usr/lib/tomboy/addins/Evolution.dll
[DEBUG 11:46:45.921] AddinManager.OnAddinLoaded: Tomboy.StickyNoteImportAddin
[DEBUG 11:46:45.922] 	       Name: Sticky Notes Importer
[DEBUG 11:46:45.922] 	Description: Import your notes from the Sticky Notes applet.
[DEBUG 11:46:45.922] 	  Namespace: Tomboy
[DEBUG 11:46:45.922] 	    Enabled: True
[DEBUG 11:46:45.922] 	       File: /usr/lib/tomboy/addins/StickyNoteImport.dll
[DEBUG 11:46:45.922] StickyNoteImporter: Sticky Notes XML file does not exist or is invalid!
[ERROR 11:46:45.947] Unparsable last-sync-date element in /home/alexandre/.config/tomboy/manifest.xml
[DEBUG 11:46:45.948] Unable to locate 'wdfs' in your PATH
[DEBUG 11:46:45.949] Autosync pref changed...restarting sync timer
[DEBUG 11:46:45.964] Tomboy remote control active.

Thanks,
Alex