I wanted to post this thread to let people know about this issue... If you are using Apple Remote Desktop to connect to a computer which has Parallels 5584 installed along with Leopard 10.5.2 + Leopard Graphics update, Parallels will hang when you attempt to launch it on that remote computer. I discovered this thread while searching on my problem and found that another user had determined another screen sharing program had caused identical hanging problems. http://forum.parallels.com/showthread.php?p=97608 Thankfully you are able to reconnect via Apple Remote Desktop once Parallels has finished launching. But you cannot launch Parallels while the Apple Remote Desktop connection is in place. Weird!