If I upgrade to Lion, will I still be able to use iChat to take over my elderly father's Mac (we have MobileMe accounts) to help him with problems and software updates? I read in some forums that this is broken in Lion, but I don't know if those were isolated incidents or not. Kindly requesting that gracious Lion iChat users test this and report results here.
I used it today. Lion to Snow Leopard and Lion to Lion. Worked fine. I didn't even think about it not working until I read this… :-)
I also have the problem screensharing a Lion machine viewed on a Snow Leopard machine, but not the other way around. I stumbled on a fix. If you first start a video chat and then start screen sharing while the video chat is underway, it is able to connect. I was able to verify this several tries with it not working unless I first video chat.
It also still works with Leopard, as I have tested with my parents' PPC iMac.
It works for me Lion->Lion and Lion->Snow Leopard. So if you can do it now on then you probably won't have a problem.
iChat screen share from Snow Leopard to Lion don't work for me. Lion to Snow Leopard is ok.