[orca-list] Orca does not see any app

[Sebastien Hinderer <Sebastien Hinderer ens-lyon org>]

Dear all,

I'm having a problem with Orca on Debian unstable, i.e. orca version
2.30.2-2. I'm running the graphical interface from the Linux console
with the following command:
startx /usr/bin/gnome-session
Then Orca is ran automatically by Gnome.
Everything was working properly till recently.
Now, Orca shows its startup message in Braille and hangs up after a
while, leaving brltty's "screen not in text mode" be displayed on the
braille display.
Orca's debugging output is included below. 
The fact that speech and magnification are disabled is intended.
Any help would be warmly appreciated.
Thanks much in advance !
Sebastien.

Speech module has NOT been initialized.
Braille module has been initialized using WINDOWPATH=7
braille display size = (40, 1)
Magnification module has NOT been initialized.
SPEECH OUTPUT: 'Bienvenue dans Orca.'
BRAILLE LINE:  'Bienvenue dans Orca.'
     VISIBLE:  'Bienvenue dans Orca.', cursor=0
NEW SCRIPT: default (module=orca.default)
ACTIVE SCRIPT: default (module=orca.default) (reason=activate)
Script.getKnownApplications...
TIMEOUT: something has hung.  Aborting.

  File "<string>", line 1, in <module>
  File "/usr/lib/pymodules/python2.6/orca/orca.py", line 1777, in main
    start(pyatspi.Registry) # waits until we stop the registry
  File "/usr/lib/pymodules/python2.6/orca/orca.py", line 1313, in start
    _switchToPresentationManager(0) # focus_tracking_presenter
  File "/usr/lib/pymodules/python2.6/orca/orca.py", line 158, in _switchToPresentationManager
    _PRESENTATION_MANAGERS[_currentPresentationManager].activate()
  File "/usr/lib/pymodules/python2.6/orca/focus_tracking_presenter.py", line 1091, in activate
    win = orca_state.activeScript.findActiveWindow()
  File "/usr/lib/pymodules/python2.6/orca/default.py", line 7763, in findActiveWindow
    apps = self.getKnownApplications()
  File "/usr/lib/pymodules/python2.6/orca/default.py", line 7498, in getKnownApplications
    pyatspi.Registry.getDesktop(0))
  File "/usr/lib/pymodules/python2.6/pyatspi/accessible.py", line 432, in __iter__
    yield self.getChildAtIndex(i)
  File "/usr/lib/pymodules/python2.6/pyatspi/accessible.py", line 232, in _inner
    return func(self, *args, **kwargs)
  File "/usr/lib/pymodules/python2.6/pyatspi/accessible.py", line 378, in __new__
    def __new__(cls):
  File "/usr/lib/pymodules/python2.6/orca/orca.py", line 1336, in timeout
    debug.printStack(debug.LEVEL_ALL)
  File "/usr/lib/pymodules/python2.6/orca/debug.py", line 136, in printStack
    traceback.print_stack(None, 100, debugFile)