I have used Screen Sharing via the "Back to my Mac" feature of MobileMe for a while, always without problem. I'd use it all the time to control my home computer from my work. Now after updating the computer to 10.6.4 the screen sharing stopped working. I can access the drives and volumes on the computer, but can't do a screen sharing. I can access the other MacPro that is on the same network but has 10.6.3 fine, without any problem. Any ideas how do I do to fix this?