ARD and screen sharing become unresponsive when switching users
http://discussions.apple.com/thread.jspa?threadID=2177922
Whenever I'm sharing the screen of any headless Mac and I attempt to use fast user switching, the screen sharing window closes and I am unable to reconnect to screen sharing on the remote Mac until I reboot it.
This isn't a one-off problem with some esoteric feature that is rarely used. This is a serious bug related to an established and useful feature of the operating system. This problem has been happening for more than a year over Mac OS X versions since at least 10.5.8. There is an OpenRadar bug report for it. (See archived thread link.) This problem is an enormous pain to me and the enterprise customers I represent Apple to.
<Edited by Host>
MacBook Pro 15" Mid-2010, Mac OS X (10.6.6)