UnicodeError: String parameters to be sent over D-Bus must be valid UTF-8

following on from bug 368626, on current natty:

the client gets stuck with this shown at the end of the log:

2011-07-09 05:08:04,274 - ubuntuone.SyncDaemon.ActionQueue - DEBUG - Upload share:'8f2ec7b1-7722-484e-
babb-3905965a43dc' node:marker:4ac245fa-2e2d-4500-8b60-738fa3596a99 Upload(share_id="'8f2ec7b1-7722-484e-babb-3905965a43dc
'", hash="'sha1:e768d5e5baf40b1cb188be282b3b5359b9dbb872'", running='False', node_id='marker:4ac245fa-2e2d-4500-8b60-738fa35
96a99', upload_id='None', crc32='2246405089L', path="'/home/mbp/Music/Sigur_R\\xc3\\xb3s/\\xc3\\x81g\\xc3\\xa6tis Byrjun/05_
Sigur_Ros__N\\xfd_batter\\xed.ogg'", previous_hash="''", size='13478182') starting
2011-07-09 05:08:04,274 - ubuntuone.SyncDaemon.ActionQueue - DEBUG - Upload share:'8f2ec7b1-7722-484e-
babb-3905965a43dc' node:marker:4ac245fa-2e2d-4500-8b60-738fa3596a99 Upload(share_id="'8f2ec7b1-7722-484e-babb-3905965a43dc
'", hash="'sha1:e768d5e5baf40b1cb188be282b3b5359b9dbb872'", running='False', node_id='marker:4ac245fa-2e2d-4500-8b60-738fa35
96a99', upload_id='None', crc32='2246405089L', path="'/home/mbp/Music/Sigur_R\\xc3\\xb3s/\\xc3\\x81g\\xc3\\xa6tis Byrjun/05_
Sigur_Ros__N\\xfd_batter\\xed.ogg'", previous_hash="''", size='13478182') semaphore acquired
2011-07-09 05:08:04,275 - ubuntuone.SyncDaemon.sync - DEBUG - T:LOCAL:F 4ac245fa-2e2d-4500-8b60-738fa3596a99 ['8f2ec7b1-7722
-484e-babb-3905965a43dc'::marker:4ac245fa-2e2d-4500-8b60-738fa3596a99] ''Music/Sigur_R\xc3\xb3s/\xc3\x81g\xc3\xa6tis Byrjun/
05_Sigur_Ros__N\xfd_batter\xed.ogg'' | Called put_file
2011-07-09 05:08:04,275 - ubuntuone.SyncDaemon.ActionQueue - DEBUG - Upload share:'8f2ec7b1-7722-484e-
babb-3905965a43dc' node:marker:4ac245fa-2e2d-4500-8b60-738fa3596a99 Upload(share_id="'8f2ec7b1-7722-484e-babb-3905965a43dc
'", hash="'sha1:e768d5e5baf40b1cb188be282b3b5359b9dbb872'", running='False', node_id='marker:4ac245fa-2e2d-4500-8b60-738fa35
96a99', upload_id='None', crc32='2246405089L', path="'/home/mbp/Music/Sigur_R\\xc3\\xb3s/\\xc3\\x81g\\xc3\\xa6tis Byrjun/05_
Sigur_Ros__N\\xfd_batter\\xed.ogg'", previous_hash="''", size='13478182') compressing: '/home/mbp/Music/Sigur_R\xc3\xb3s/\xc
3\x81g\xc3\xa6tis Byrjun/05_Sigur_Ros__N\xfd_batter\xed.ogg'
2011-07-09 05:08:04,276 - ubuntuone.SyncDaemon.EQ - ERROR - Error encountered while handling: SYS_QUEUE_ADDED in <ubuntuone.
syncdaemon.interaction_interfaces.SyncdaemonEventListener object at 0x46d1650>
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/syncdaemon/event_queue.py", line 286, in _dispatch
    method(**kwargs)
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/syncdaemon/interaction_interfaces.py", line 1108, in handle_
SYS_QUEUE_ADDED
    self.interface.status.emit_requestqueue_added(op_name, op_id, data)
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/platform/linux/dbus_interface.py", line 355, in emit_request
queue_added
    self.RequestQueueAdded(op_name, str(op_id), data)
  File "/usr/lib/pymodules/python2.7/dbus/decorators.py", line 309, in emit_signal
    message.append(signature=signature, *args)
UnicodeError: String parameters to be sent over D-Bus must be valid UTF-8
2011-07-09 05:08:04,278 - ubuntuone.SyncDaemon.InvalidNames - INFO - IN_OPEN in u'/home/mbp/Music/Sigur_R\xf3s/\xc1g\xe6tis Byrjun': path '05_Sigur_Ros__N\xfd_batter\xed.ogg'
2011-07-09 05:08:04,278 - ubuntuone.SyncDaemon.EQ - DEBUG - push_event: FS_INVALID_NAME, kwargs: {'dirname': u'/home/mbp/Music/Sigur_R\xf3s/\xc1g\xe6tis Byrjun', 'filename': '05_Sigur_Ros__N\xfd_batter\xed.ogg'}
2011-07-09 05:08:04,581 - ubuntuone.SyncDaemon.ActionQueue - INFO - Connection made.
2011-07-09 05:08:04,581 - ubuntuone.SyncDaemon.StorageClient - INFO - Connection made.
2011-07-09 05:08:04,582 - ubuntuone.SyncDaemon.EQ - DEBUG - push_event: SYS_CONNECTION_MADE, kwargs: {}
2011-07-09 05:08:04,582 - ubuntuone.SyncDaemon.StateManager - DEBUG - received event 'SYS_CONNECTION_MADE'
2011-07-09 05:08:04,582 - ubuntuone.SyncDaemon.StateManager - DEBUG - Transition READY --[SYS_CONNECTION_MADE]--> CHECK_VERSION (queues: WORKING; connection: With User With Network)
2011-07-09 05:08:04,583 - ubuntuone.SyncDaemon.ConnectionManager - DEBUG - Setting up the 'handshake' timer on 50 secs
2011-07-09 05:08:04,583 - ubuntuone.SyncDaemon.EQ - DEBUG - push_event: SYS_STATE_CHANGED, kwargs: {'state': CHECK_VERSION (error=False connected=True online=False) Queue: WORKING Connection: With User With Network}
2011-07-09 05:08:04,591 - ubuntuone.SyncDaemon.EQ - ERROR - Error encountered while handling: SYS_CONNECTION_MADE in <ubuntuone.syncdaemon.status_listener.StatusListener object at 0x46d1990>
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/syncdaemon/event_queue.py", line 286, in _dispatch
    method(**kwargs)
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/syncdaemon/status_listener.py", line 111, in handle_SYS_CONNECTION_MADE
    self.status_frontend.server_connection_made()
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/status/aggregator.py", line 857, in server_connection_made
    self.aggregator.connection_made()
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/status/aggregator.py", line 779, in connection_made
    self.file_discovery_bubble.connection_made()
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/status/aggregator.py", line 515, in connection_made
    self._popup()
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/status/aggregator.py", line 490, in _popup
    self.notification.send_notification(UBUNTUONE_TITLE, text)
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/status/aggregator.py", line 149, in send_notification
    return self.notification.send_notification(*args)
  File "/usr/lib/pymodules/python2.7/ubuntuone-client/ubuntuone/platform/linux/notification.py", line 55, in send_notification
    self.notification.show()
GError: Connection was disconnected before a reply was received
2011-07-09 05:08:04,594 - ubuntuone.SyncDaemon.InteractionInterfaces - DEBUG - called current_status

magicicada shows it repeatedly starting and stopping.

those names apparently are invalid but obviously it shouldn't stop.