Update:

I just started ubuntu and the bug showed up again. As usual, as soon as NM detects a network, docky goes down.

This is the code from .xsession-errors:

** (nm-applet:5648): WARNING **: applet-device-wifi.c.1597 (get_secrets_dialog_response_cb): canceled
** (nm-applet:5648): DEBUG: old state indicates that this was not a disconnect 9
[Info  09:43:20.242] [DrawingService] Could not find 'gajim', using fallback of 'extension'.
[Debug 09:43:20.332] [AbstractWeatherSource] Weather Channel: reload success
[Warn  09:43:20.486] [DrawingService] Error loading icon from file '/usr/share/pithos/media/icon.svg': Apertura del file «/usr/share/pithos/media/icon.svg» non riuscita: Nessun file o directory
[Debug 09:43:20.490] [DrawingService]   at Gdk.Pixbuf..ctor (System.String filename, Int32 width, Int32 height, Boolean preserve_aspect_ratio) [0x00000] 
  at Docky.Services.DrawingService.IconFromFile (System.String name, Int32 width, Int32 height) [0x0005a] in /build/buildd/docky-2.1.0~bzr1641/Docky.Services/Docky.Services/DrawingService.cs:329 
[Info  09:43:20.490] [DrawingService] Could not find '/usr/share/pithos/media/icon.svg', using fallback of 'extension'.
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.ArgumentOutOfRangeException: Alpha must be between 0 and 1
Parameter name: Alpha
  at Cairo.Color_Extensions.SetAlpha (Color self, Double alpha) [0x0001e] in /build/buildd/docky-2.1.0~bzr1641/Docky.CairoHelper/Cairo/Color_Extensions.cs:71 
  at Docky.Interface.DockWindow.DrawActiveIndicator (Docky.CairoHelper.DockySurface surface, Rectangle area, Color color, Double opacity) [0x00121] in /build/buildd/docky-2.1.0~bzr1641/Docky/Docky/Interface/DockWindow.cs:2475 
  at Docky.Interface.DockWindow.DrawItem (Docky.CairoHelper.DockySurface surface, Rectangle dockArea, Docky.Items.AbstractDockItem item) [0x00780] in /build/buildd/docky-2.1.0~bzr1641/Docky/Docky/Interface/DockWindow.cs:2422 
  at Docky.Interface.DockWindow.DrawDock (Docky.CairoHelper.DockySurface surface) [0x00141] in /build/buildd/docky-2.1.0~bzr1641/Docky/Docky/Interface/DockWindow.cs:2127 
  at Docky.Interface.DockWindow.OnExposeEvent (Gdk.EventExpose evnt) [0x000c3] in /build/buildd/docky-2.1.0~bzr1641/Docky/Docky/Interface/DockWindow.cs:2690 
  at Gtk.Widget.exposeevent_cb (IntPtr widget, IntPtr evnt) [0x00000] 
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Widget.exposeevent_cb(IntPtr widget, IntPtr evnt)
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Docky.Docky.Main(System.String[] args) in /build/buildd/docky-2.1.0~bzr1641/Docky/Docky/Docky.cs:line 95
Cairo.Context: called from finalization thread, programmer is missing a call to Dispose
Cairo.Context: called from finalization thread, programmer is missing a call to Dispose
Cairo.Context: called from finalization thread, programmer is missing a call to Dispose
Cairo.Context: called from finalization thread, programmer is missing a call to Dispose
** (nm-applet:5648): DEBUG: going for offline with icon: notification-network-wireless-disconnected

(gnome-terminal:5961): Gtk-CRITICAL **: gtk_accel_map_unlock_path: assertion `entry != NULL && entry->lock_count > 0' failed

Docky version: 2.1.0~bzr1641-0ubuntu1~10.04~dockycore1

Mono version: 2.4.4~svn151842-1ubuntu4

Gnome version: 2.30.2