Comment 2 for bug 657850

Reproducible with
ubuntuone-client-gnome:
  Installed: 1.4.4.1-0ubuntu1
  Candidate: 1.4.4.1-0ubuntu1

If management db of couchdb does not contain pairing record for Ubuntu One, ubuntuone-preferences prints
ERROR:dbus.connection:Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 214, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/bin/ubuntuone-preferences", line 1051, in got_newcredentials
    self.present()
  File "/usr/bin/ubuntuone-preferences", line 1031, in present
    self.dialog.connect_desktopcouch_exclusion()
  File "/usr/bin/ubuntuone-preferences", line 708, in connect_desktopcouch_exclusion
    self.dcouch = dcouch.ReplicationExclusion()
  File "/usr/lib/python2.6/dist-packages/desktopcouch/replication_services/ubuntuone.py", line 134, in __init__
    raise ValueError("No pairing record for ubuntuone.")
ValueError: No pairing record for ubuntuone.

And can be recovered from this state ( http://ubuntuone.com/p/JeY/ ) only by triggering CredentialsFound signal by another application.