Mouse stops working when connected usb-storage-device

This bug has been copied automatically from: https://bugs.launchpad.net/qemu/+bug/1323758

I'm running a guest that has Windows 8 Pro (x64) installed. Every time I
pass through a usb storage device from the host to the guest, the mouse
stops working in the vnc client. When I remove the usb-device the mouse
works again.

The mouse only stops working when I pass through a usb storage device and
then make the vlc viewer (client) inactive by clicking on another program
on the local computer (where I'm running the vnc viewer (client)). As long
as I keep the vnc viewer active, the mouse works without any problems. But
as soon as I make the vnc viewer inactive and then active again, the mouse
will no longer work. I have to reboot the guest or remove the usb storage
device.

I can't find any related problems on the internet, so it may be just me?

I hope someone can help me with this.

EDIT: I posted the extra/new information in comments. But as I know see it
might be wrong and maybe I should've posted them in this bug description
container (by editing)? Please tell me if I did it wrong and I will change
it. Sorry for this misunderstanding.