Sorry, should've posted the terminal output when launching AWN.
Here goes:
pablo@ubuntu64:~$ avant-window-navigator
Screen is composited
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5263] for "yama.desktop", UID: 1263683830, XID: 33554500
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5265] for "taskmanager.desktop", UID: 1263686116, XID: 33554501
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5266] for "file-browser-launcher.desktop", UID: 1263683745, XID: 33554502
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5267] for "stacks.desktop", UID: 1263683821, XID: 33554503
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5268] for "media-control.desktop", UID: 1263683780, XID: 33554504
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5269] for "weather.desktop", UID: 1263683827, XID: 33554505
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5270] for "mail.desktop", UID: 1263721813, XID: 33554506
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5271] for "mail.desktop", UID: 1263721870, XID: 33554507
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5272] for "cairo-clock.desktop", UID: 1263684731, XID: 33554508
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5273] for "quit.desktop", UID: 1263683814, XID: 33554509
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5274] for "garbage.desktop", UID: 1263683752, XID: 33554510
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5275] for "notification-daemon.desktop", UID: 1263690110, XID: 33554511
** (avant-window-navigator:5262): DEBUG: Spawned awn-applet[5276] for "notification-area.desktop", UID: 1263688200, XID: 33554512
['--uid=1263683821', '--window=33554503', '--panel-id=1']
** (awn-applet:5265): WARNING **: desktop-entry-impl-glib.vala:224: Error trying to retrieve 'Icon': Key file does not have key 'Icon'
(awn-applet:5275): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.22.3/gobject/gsignal.c:2270: signal `url_activated' is invalid for instance `0x1ec5110'
(awn-applet:5275): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.22.3/gobject/gsignal.c:2270: signal `url_activated' is invalid for instance `0x1ec55f0'
** (awn-applet:5265): DEBUG: Feeding the cache
** Message: Adding /usr/local/share//applications/
** Message: Adding /usr/share//applications/
** (awn-applet:5265): WARNING **: desktop-entry-impl-glib.vala:224: Error trying to retrieve 'Name': Key file contains key 'Name' which has value that cannot be interpreted.
(awn-applet:5265): GLib-CRITICAL **: g_utf8_strdown: assertion `str != NULL' failed
** (awn-applet:5265): DEBUG: Done Feeding the cache
/usr/lib/pymodules/python2.6/awn/extras/awnlib.py:424: GtkWarning: gdk_window_get_origin: assertion `GDK_IS_WINDOW (window)' failed
self.__parent.set_tooltip_text(text)
/usr/lib/pymodules/python2.6/awn/extras/awnlib.py:424: GtkWarning: gdk_drawable_get_size: assertion `GDK_IS_DRAWABLE (drawable)' failed
self.__parent.set_tooltip_text(text)
** (awn-applet:5265): DEBUG: Matching score: 90, must be bigger then:0, groups: 1
** (awn-applet:5265): DEBUG: Matching score: 94, must be bigger then:0, groups: 1
/usr/lib/pymodules/python2.6/awn/extras/awnlib.py:424: GtkWarning: gdk_window_get_origin: assertion `GDK_IS_WINDOW (window)' failed
self.__parent.set_tooltip_text(text)
/usr/lib/pymodules/python2.6/awn/extras/awnlib.py:424: GtkWarning: gdk_drawable_get_size: assertion `GDK_IS_DRAWABLE (drawable)' failed
self.__parent.set_tooltip_text(text)
** (awn-applet:5265): DEBUG: Matching score: 0, must be bigger then:0, groups: 0
** Message: awn_desktop_lookup_search_by_wnck_window: Hit method = 9