Mouse disappears if I logout.

[Magicloud Wang]

Dear,
	I am using 7.10 with kde and kdm.
	After I start my machine, the mouse works fine. But if I logout in kde, 
return to kdm, the mouse pointer disappears. And I tried to move the mouse 
and click, then I think there is not an "invisible" mouse pointer there.
	I need to reboot to fix this.
	I am using nvidia mainboard and ps/2 mouse.
	There is no error message in /var/log/message.
	Any idea?

Thanks.