mouse cursor and rotated display - multiple cursors

[frimble]

With solaris (oracle's closed one, not opensolaris)..
In windows 7, rotate the display (from landscape to portrait).
Start solaris in a virtual machine and there is a fascinating quirk/bug.

The mouse cursor in the virtual machine is now several cursors, superimposed. Run X, and you will get different mouse cursors, but always several superimposed. It makes it a challenge to find the mouse hot spot. You may, for example, have a X pointer arrow, an hourglass and a little hand on top of each other.

While the virtual machine is running, swap back to windows, rotate the display back to the default. Go back to solaris and the problem is gone.
This is reproducible.
Finally, go back to solaris, and ctrl-I to turn of mouse integration. The problem goes away and you only have the expected cursor, regardless of the screen/display orientation.

This happens with virtualbox 3.1.6.
This may be so obscure, it is not worth worrying about, but maybe not. If you have a large display, I am probably not the only person who prefers to work in portrait mode.

[alfie]

Let me confirm, this problem with multiple, overlaid cursors also happens with opensolaris if you have the monitor rotated to portrait mode.