Better today. Problem appears gone but the log files do not agree. I performed complete reset including reset on desktop couch and with the 1.1.91-0ubuntu1 package I have contacts again. the error message in oauth-login.log still shows but it clearly is connecting and synchronizing since both my ~/.local/share/desktop-couch directory and Evolution now show actual contacts and the count now matches my other systems. I did not see release notes on the 1.1.91 that would indicate that this solved the problem. I'm fine to live with the error message in oauth-login.log since it doesn't ultimately seem to be affecting me anymore and doesn't reoccur.

ubuntuone-client (1.1.91-0ubuntu1) lucid; urgency=low

  * New upstream release.
    - Fix to avoid AttributeError on exit (LP: #553318)
    - Fix typo and string change in prefs app (LP: #553324)
    - Add missing autostart files to packages (LP: #534707)

 -- Rodney Dawes <email address hidden>  Thu, 01 Apr 2010 16:17:17 -0400

ubuntuone-client:
  Installed: 1.1.91-0ubuntu1
  Candidate: 1.1.91-0ubuntu1
  Version table:
 *** 1.1.91-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status


paul@nettop:~/.cache/ubuntuone/log$ cat syncdaemon-exceptions.log
2010-04-07 09:54:04,399 - dbus.connection - ERROR - 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 1067, in got_newcredentials
    self.present()
  File "/usr/bin/ubuntuone-preferences", line 1062, in present
    if self.dialog.visible:
AttributeError: 'UbuntuOneDialog' object has no attribute 'visible'
2010-04-07 09:54:05,210 - ubuntuone-preferences - ERROR - [Failure instance: Traceback (failure with no frames): <class 'dbus.exceptions.DBusException'>: org.freedesktop.DBus.Python.KeyError: Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dbus/service.py", line 702, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/lib/python2.6/dist-packages/ubuntuone/syncdaemon/dbus_interface.py", line 1294, in get_info
    mdobj = self.fs.get_by_path(path.encode('utf-8'))
  File "/usr/lib/python2.6/dist-packages/ubuntuone/syncdaemon/filesystem_manager.py", line 549, in get_by_path
    mdid = self._idx_path[path]
KeyError: '/home/paul/.ubuntuone/Purchased from Ubuntu One'


paul@nettop:~/.cache/ubuntuone/log$ cat oauth-login.log 
2010-04-07 09:40:06,740:740.748882294 ubuntuone-login Starting Ubuntu One login manager version 1.1.91
2010-04-07 09:41:58,896:896.936893463 UbuntuOne.OAuthDesktop.auth Token was not successfully retrieved: data was 'Invalid request token: 0HxcCnL2Ls0D3rWPx3CZ'
2010-04-07 09:41:58,898:898.395061493 UbuntuOne.OAuthDesktop.auth Failed to get access token.
2010-04-07 09:41:58,908:908.283948898 ubuntuone-login Invalid request token: 0HxcCnL2Ls0D3rWPx3CZ
2010-04-07 09:41:59,079:79.9880027771 ubuntuone-login Access to Ubuntu One was denied.
2010-04-07 09:42:44,722:722.321033478 ubuntuone-login Starting Ubuntu One login manager version 1.1.91
2010-04-07 09:45:59,479:479.393005371 ubuntuone-login Starting Ubuntu One login manager version 1.1.91
2010-04-07 09:54:01,677:677.077054977 ubuntuone-login Starting Ubuntu One login manager version 1.1.91