Comment 7 for bug 1071063

Update 2

after today upgrade of DockbarX from 0.48 to 0.90.3-1 (Precise ..since I use Linux MInt with Precise repositories )

DockbarX standalone stopped working

the comand line :

sorin@sorin-sys ~ $ dockx
DockbarX 0.90.3
DockbarX init

** (dockx:26779): WARNING **: Binding '<super>Tab' failed!
Error: DockbarX couldn't set global keybinding '<super>Tab' for gkeys_select_next_group.
DockbarX reload
Name net.launchpad.DockManager is already in use. (This instance of) DockbarX will not use DockManager.
Traceback (most recent call last):
  File "/usr/bin/dockx", line 1306, in <module>
    dockx = DockX(monitor)
  File "/usr/bin/dockx", line 504, in __init__
    self.dockbar.load()
  File "/usr/lib/pymodules/python2.7/dockbarx/dockbar.py", line 288, in load
    self.reload()
  File "/usr/lib/pymodules/python2.7/dockbarx/dockbar.py", line 359, in reload
    self.__on_window_opened(self.screen, window)
  File "/usr/lib/pymodules/python2.7/dockbarx/dockbar.py", line 489, in __on_window_opened
    self.__add_window(window)
  File "/usr/lib/pymodules/python2.7/dockbarx/dockbar.py", line 642, in __add_window
    group.add_window(window)
  File "/usr/lib/pymodules/python2.7/dockbarx/groupbutton.py", line 358, in add_window
    window = Window(wnck_window, self)
  File "/usr/lib/pymodules/python2.7/dockbarx/windowbutton.py", line 76, in __init__
    self.item = WindowItem(self, group)
  File "/usr/lib/pymodules/python2.7/dockbarx/windowbutton.py", line 343, in __init__
    self.update_show_state()
  File "/usr/lib/pymodules/python2.7/dockbarx/windowbutton.py", line 457, in update_show_state
    window.monitor != self.group_r().monitor):
AttributeError: Window instance has no attribute 'monitor'

maybe this will help in some way ..