Opera Web Browser's fails on Ubuntu 12.10 unstable release

Well, it explains to you a fail that I discovered in Ubuntu 12.10, version beta.

I'm using Opera Web Browser 12.02, my sistem is i686, 3.5.0-14-generic.

The problem is the tab: I open a new tab to sail on the web, then, I close that tab, but it left a rest of the image tab of tabs closed before.
Here is a screen-shot of it (look to the tabs): https://docs.google.com/open?id=0B3ANzuiBrJJmdDVkemhRb3J5X1E

To see what happen, I typed on Terminal the Opera executable to see the problem, and show me that:
---------------------------------------------------------------------------------------------------------------------------------------------
dave@dave-Satellite-A300:~$ '/opt/opera/bin/opera'

(opera:2497): Gtk-CRITICAL **: gtk_style_context_set_path: assertion `priv->widget == NULL' failed

** (opera:2497): CRITICAL **: os_bar_hide: assertion `OS_IS_BAR (bar)' failed

(opera:2497): Gtk-CRITICAL **: gtk_widget_hide: assertion `GTK_IS_WIDGET (widget)' failed

** (opera:2497): CRITICAL **: os_bar_set_parent: assertion `OS_IS_BAR (bar)' failed

** (opera:2497): CRITICAL **: os_bar_hide: assertion `OS_IS_BAR (bar)' failed

(opera:2497): Gtk-CRITICAL **: gtk_widget_hide: assertion `GTK_IS_WIDGET (widget)' failed

** (opera:2497): CRITICAL **: os_bar_set_parent: assertion `OS_IS_BAR (bar)' failed

** (opera:2497): CRITICAL **: os_bar_hide: assertion `OS_IS_BAR (bar)' failed

(opera:2497): Gtk-CRITICAL **: gtk_widget_hide: assertion `GTK_IS_WIDGET (widget)' failed

** (opera:2497): CRITICAL **: os_bar_set_parent: assertion `OS_IS_BAR (bar)' failed

** (opera:2497): CRITICAL **: os_bar_hide: assertion `OS_IS_BAR (bar)' failed

(opera:2497): Gtk-CRITICAL **: gtk_widget_hide: assertion `GTK_IS_WIDGET (widget)' failed

** (opera:2497): CRITICAL **: os_bar_set_parent: assertion `OS_IS_BAR (bar)' failed
---------------------------------------------------------------------------------------------------------------------------------------------
I hope there are a solution for that.
Of course, I typed ubuntu-bug ID(opera ID), but it tell me there are no fails... I don't understand well... If you need more information about that, please, contact me.