I've downloaded the new one from http://repository.glx-dock.org/ubuntu/dists/maverick/
The problem remains: when launchers move his basis disappears,
when other icons move the halo appears.

In addiction to this in version 2.2.0-2-1 cairo-dock -o gives this results
______________________________________________________________________________________________
 ============================================================================ 
	Cairo-Dock version: 2.2.0-2
	Compiled date:  Sep 18 2010 12:10:12
	Running with OpenGL: 1
 ============================================================================

info on the system :
Linux sfx-laptop 2.6.35-22-generic-pae #33-Ubuntu SMP Sun Sep 19 22:14:14 UTC 2010 i686 GNU/Linux
Couldn't guess if it was an applet's fault or not. It may have crashed inside the core or inside a thread

 ============================================================================ 
	Cairo-Dock version: 2.2.0-2
	Compiled date:  Sep 18 2010 12:10:12
	Running with OpenGL: 1
 ============================================================================

showing the maintenance mode ...
_________________________________________________________________________________________________
and starts in maintenance mode. But I've fixed in some way and I'm not able to repeat the error any more.

Then I've noticed that the configuration tool crashes with this error:
_________________________________________________________________________________________________
info on the system :
Linux sfx-laptop 2.6.35-22-generic-pae #33-Ubuntu SMP Sun Sep 19 22:14:14 UTC 2010 i686 GNU/Linux
The applet 'shortcuts' may be the culprit
 ============================================================================ 
	Cairo-Dock version: 2.2.0-2
	Compiled date:  Sep 18 2010 12:10:12
	Running with OpenGL: 1
 ============================================================================

cairo_dock_set_status_message (Something went wrong with the applet 'shortcuts'...)
showing the maintenance mode ...
____________________________________________________________________________________________
It happens if "Animated icon" or "icon effect" is enabled and I click continuously on "systray" or "logout" applet
Sometimes it crashes without this log.

The applet gnomenu doesn't need "animated icon" or "icon effect" to crash when I click many times:
_________________________________________________________________________________________________

gconf backend
>>> INIT
Traceback (most recent call last):
  File "./GnoMenu", line 190, in <module>
    appleticon = AppletIcon( icon_object=myIcon)
  File "./GnoMenu", line 114, in __init__
    self.get_geometry()
  File "./GnoMenu", line 127, in get_geometry
    props = myIcon.GetAll();
  File "/usr/lib/pymodules/python2.6/dbus/proxies.py", line 68, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/pymodules/python2.6/dbus/proxies.py", line 140, in __call__
    **keywords)
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 620, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: Method "GetAll" with signature "" on interface "org.cairodock.CairoDock.applet" doesn't exist

info on the system :
Linux sfx-laptop 2.6.35-22-generic-pae #33-Ubuntu SMP Sun Sep 19 22:14:14 UTC 2010 i686 GNU/Linux
Couldn't guess if it was an applet's fault or not. It may have crashed inside the core or inside a thread

 ============================================================================ 
	Cairo-Dock version: 2.2.0-2
	Compiled date:  Sep 18 2010 12:10:12
	Running with OpenGL: 1
 ============================================================================

gconf backend
>>> module 'GnoMenu' can't be found on the bus, exit.
info on the system :
Linux sfx-laptop 2.6.35-22-generic-pae #33-Ubuntu SMP Sun Sep 19 22:14:14 UTC 2010 i686 GNU/Linux
Couldn't guess if it was an applet's fault or not. It may have crashed inside the core or inside a thread

 ============================================================================ 
	Cairo-Dock version: 2.2.0-2
	Compiled date:  Sep 18 2010 12:10:12
	Running with OpenGL: 1
 ============================================================================

gconf backend
>>> module 'GnoMenu' can't be found on the bus, exit.
showing the maintenance mode ..
___________________________________________________________________________________________
In order to use the dock, I have to disable gnomenu with cairo-dock -c because the maintenance mode
will not let me to do this.