the best fix is to add a new app on the startup apps
sleep 10 ; gnome-panel
it works!
I think that i have to put these comands on a script yo get working

2010/12/18 Teej <email address hidden>

> All of these comments would be better suited for the GNOME upstream bug
> tracker https://bugzilla.gnome.org/show_bug.cgi?id=596923. If you have
> any actual information that can assist in the development and/or fix of
> this bug, please send it there.
> Further general discussion or chat should be left to the appropriate
> mailing lists or ubuntu IRC channels.
> Please bear in mind that EVERY single message (useful or not) gets sent
> to those subscribed and those from duplicates (300+). So please keep any
> further messages to a bare minimum unless you can help.
> We know what this looks like and pretty much covered how to reproduce
> it.
> Sorry if this sounds harsh, but 300+ people will not be happy being
> bombarded by useless messages (I'm looking at the last two posters). You
> can contact each other as explained above: through the mailing lists,
> IRC or directly through the "Contact User" page in Launchpad.
>
> Thank you.
>
> --
>
> Roy Jamison (xteejx)
> Ubuntu Bug Squad
> Ubuntu Bug Control
> www.ubuntu.com
>
> --
> You received this bug notification because you are a direct subscriber
> of a duplicate bug (598065).
> https://bugs.launchpad.net/bugs/439448
>
> Title:
>  Visual corruption affecting several panel applets
>
> Status in Compiz:
>  Invalid
> Status in Desktop panel for GNOME:
>  New
> Status in Indicator Applet:
>  Invalid
> Status in Release Notes for Ubuntu:
>  In Progress
> Status in “gnome-panel” package in Ubuntu:
>  Triaged
> Status in “gnome-panel” source package in Lucid:
>  Confirmed
> Status in “gnome-panel” source package in Maverick:
>  Triaged
> Status in “gnome-panel” source package in Natty:
>  Triaged
>
> Bug description:
>  **********PLEASE READ BEFORE YOU ADD YOUR
> COMMENT/SCREENSHOT*****************
>
> Please take a look at the list of duplicate bugs. Please think on how many
> people get notified when you add anything to this bug report. Please don't
> confirm the bug it is already confirmed. Please don't attach further
> screenshots - we all know how the problem looks. We all appreciate your
> involvement, but read previous post carefully prior you post your own. We
> need to draw constructive conclusions and find the solution.
>
> Binary package hint: gnome-panel, nm-applet, etc...
>
> SUMMARY:
>
> After graphical logon notification area gets scrambled. Icons are in
> terrible mess. Some of them are overlapping others. Sometimes network
> manager icon is missing. Sometimes phantom icons show up. They can be clones
> of any other icons in the notification area. Bug affects any graphics card:
> ATI, nVidia, Intel...
>
> WORKAROUND 1:
>
> Run 'killall gnome-panel' from the terminal or Gnome's "Run" dialog. The
> panels will automatically respawn correctly.
>
> WORKAROUND 2:
>
> When you get your icons distorted right-click on the affected panel (not
> icons) click "Properties". In "Panel Properties" change panel orientation to
> "Left" or "Right" and back to "Top" or "Bottom". In my case all icons are
> displayed properly, but one (nm-applet) is missing.
>
> WORKAROUND 3:
>
> Right click the Gnome panel and remove the offending applets and re-add
> them, i.e. Indicator Applet, etc.
>
>
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/compiz/+bug/439448/+subscribe
>