I am running VirtualBox 4.0.10 on a RHEL 5 host, with Fedora 15 as the 
guest. VirtualBox's 3D support is good enough that I can use Gnome Shell 
in my guest login session. However, if a host OS window partially 
obscures VirtualBox's window, and then the VirtualBox window is exposed 
again, the VirtualBox window contents are not repainted. Instead, I am 
left with afterimages of the other host OS window that had previously 
been atop VirtualBox's window. This is especially extreme if the other 
host OS window is dragged across VirtualBox's window: it leaves a trail 
of host OS window afterimages behind where I should instead be seeing 
the virtual guest's video display: 
<http://forums.virtualbox.org/download/file.php?id=4705>.

Restoring the display to sanity requires doing something inside the host 
OS that causes a full screen repaint, such as bringing up the Gnome 
Shell Activities display.

This only happens when using the 3D-based Gnome Shell. If I use the 
non-3D-based fallback session (essentially, Gnome Panel), then 
VirtualBox does refresh its window properly.

Is anyone else seeing this? Can it be fixed or worked around?

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