Apparently I am not the only one having Screen Sharing problems, as I have seen several posts on here and on the Apple forum as well. I too have had Screen Sharing become almost completely useless since upgrading all systems to Lion. I use screen sharing from work to control my iMac at home. Both systems were on Snow Leopard. I bought a new MBP for work and it had Lion installed, and screen sharing took a long time to get working again, but it worked fairly well. I recently upgraded my iMac at home to Lion and now screen sharing is all but useless. One suggested solution that I read was to turn on File Sharing, but that is one at both work and home. Does anybody have any other suggestions?