Has anyone had success with leopard's screen sharing? I set up the password in preferences & firewall is allow all incoming (no forwarding necessary since this is local net). Ultravnc connects but the screen is empty. Realvnc and tightvnc's viewers connects fine but after a while of usage the screen freezes and I can't reconnect. I have to manually disconnect the screen sharing on the mac's file menu bar to re-enable vnc connections.