I'm using Screen Sharing to run some GUI apps on my Mac mini with Snow Leopard Server. The mini normally doesn't have a display (or keyboard/mouse for that matter) connected. The problem is that frequently when logging in or out, especially using Fast User Switching, Screen Sharing disconnects and then will not reconnect until I plug in or unplug a monitor, or at least the DVI adapter. Its as though it loses the screen size. And the display settings seem to only offer choices of physical monitors that have been connected before. There should really be some way to configure the Mac for headless operation. Any ideas?