xpra-0.8.0-9.fc18.x86_64
winswitch-0.12.18-2.x86_64

applet.py:751:do_stop_server:AttributeError: ServerLineConnection instance has no attribute 'stop_server'

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/winswitch/ui/dialog_util.py", line 119, in <lambda>
    dialog.connect('response', lambda dialog, response_id: ask_response_callback(dialog, response_id))
  File "/usr/lib/python2.7/site-packages/winswitch/ui/dialog_util.py", line 105, in ask_response_callback
    ok_callback()
  File "/usr/lib/python2.7/site-packages/winswitch/client/applet.py", line 746, in <lambda>
    None, lambda: self.do_stop_server(server))
  File "/usr/lib/python2.7/site-packages/winswitch/client/applet.py", line 751, in do_stop_server
    client.stop_server("User request")
AttributeError: ServerLineConnection instance has no attribute 'stop_server'

Local variables in innermost frame:
self: <winswitch.client.applet.WinSwitchApplet instance at 0x7ff10efdda70>
client: <winswitch.client.server_line_connection.ServerLineConnection instance at 0x25e1950>
server: <winswitch.objects.server_config.ServerConfig instance at 0x25eb638>

in a recent package for ubuntu 12.10

[ee] 2012/10/12 11:21:14.363124 Traceback (most recent call last):
[ee] 2012/10/12 11:21:14.363149   File "/usr/lib/python2.7/dist-packages/winswitch/server/controller.py", line 316, in ready
[ee] 2012/10/12 11:21:14.363166     self.assign_virt_utils()
[ee] 2012/10/12 11:21:14.363181   File "/usr/lib/python2.7/dist-packages/winswitch/server/controller.py", line 405, in assign_virt_utils
[ee] 2012/10/12 11:21:14.363209     from winswitch.virt.vnc_server_util import VNCServerUtil
[ee] 2012/10/12 11:21:14.363225   File "/usr/lib/python2.7/dist-packages/winswitch/virt/vnc_server_util.py", line 16, in <module>
[ee] 2012/10/12 11:21:14.363240     from winswitch.virt.server_util_base import ServerUtilBase
[ee] 2012/10/12 11:21:14.363255   File "/usr/lib/python2.7/dist-packages/winswitch/virt/server_util_base.py", line 40, in <module>
[ee] 2012/10/12 11:21:14.363270     from winswitch.util.xkbmap_util import set_keymap
[ee] 2012/10/12 11:21:14.363286   File "/usr/lib/python2.7/dist-packages/winswitch/util/xkbmap_util.py", line 173
[ee] 2012/10/12 11:21:14.363312 SyntaxError: Non-ASCII character '\xc3' in file /usr/lib/python2.7/dist-packages/winswitch/util/xkbmap_util.py on line 173, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details

I'm seeing the following error trying to connect from a 0.12.17 client on lucid to a 0.12.17 server on gentoo:

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py", line 249, in run
    self.__run()
  File "/usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py", line 120, in wrapper
    return real_cb(real_s, condition)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py", line 283, in callback
    self.simulate() # fire Twisted timers
  File "/usr/lib/python2.6/dist-packages/twisted/internet/gtk2reactor.py", line 293, in simulate
    self.runUntilCurrent()
--- <exception caught here> ---
  File "/usr/lib/python2.6/dist-packages/twisted/internet/base.py", line 778, in runUntilCurrent
    call.func(*call.args, **call.kw)
  File "/usr/lib/pymodules/python2.6/winswitch/client/server_line_connection.py", line 603, in start_login
    self.add_current_user()
  File "/usr/lib/pymodules/python2.6/winswitch/client/server_line_connection.py", line 397, in add_current_user
    self.handler.binencode(settings.xkbmap_query),
  File "/usr/lib/pymodules/python2.6/winswitch/net/protocol.py", line 90, in binencode
    return	binencode(data, self.binary_encodings)
  File "/usr/lib/pymodules/python2.6/winswitch/util/format_util.py", line 21, in binencode
    return	BASE64_PREFIX + base64.b64encode(data)
  File "/usr/lib/python2.6/base64.py", line 53, in b64encode
    encoded = binascii.b2a_base64(s)[:-1]
exceptions.TypeError: b2a_base64() argument 1 must be string or read-only buffer, not None

The connection shows up as successful, but no applications or sessions are available. This problem also happens with 0.12.16, but goes away if I downgrade the client to 0.12.15.