Does not start when switched from KDE to MATE desktop

[montuos]

I switch back and forth between KDE and MATE desktops, and although Polly works ok in KDE, it does not start in MATE. I have Polly installed on Kubuntu 12.04.3 LTS and get updates from the polly-daily repository. I'm pretty sure I installed Polly before I installed MATE, but it has been a while, so I'm not entirely sure.

When I try starting Polly from my applications menu in MATE, nothing happens, and the next time I boot into KDE I find a crash notification for it on my panel.

When I try starting from the terminal in MATE, I get the following:

~$ polly
Polly 0.93.11 (pre-alpha 3.11)
Copyright (C) 2011 Marcelo Hashimoto
cache path: /home/montuos/.cache/polly
config path: /home/montuos/.config/polly
data home: /home/montuos/.local/share/polly
initializing...
Traceback (most recent call last):
  File "/usr/bin/polly", line 303, in <module>
    account_manager = gui.twitter.account.Manager(NAME, config_path, config_path_lock, setting_factory, proxy_controller, font_scheme, identifier_factory, status_bar)
  File "/usr/lib/python2.7/dist-packages/polly/gui/twitter/account.py", line 486, in __init__
    subtoken_secret = keyring.get_password(self.name, subtoken)
  File "/usr/lib/python2.7/dist-packages/polly/external/keyring/core.py", line 37, in get_password
    return _keyring_backend.get_password(service_name, username)
  File "/usr/lib/python2.7/dist-packages/polly/external/keyring/backend.py", line 197, in get_password
    _, session = service_iface.OpenSession("plain", "")
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: Method "OpenSession" with signature "ss" on interface "org.freedesktop.Secret.Service" doesn't exist

What can I do so I can use Polly from either desktop environment?

[Conscious User (conscioususer)]

From the error message, it seems that MATE simply does not support the expected keyring interfaces. There isn't much I can do from Polly, this is a limitation of python-keyring.