Screen sharing has been a real savior with dealing with my parents and now I wanted to be able to help my daughter with her new MBP...

So she has Mountain Lion and I have Lion she is running messages and I still have iChat and it was a no go!

So I download the beta of messages and its still a no go...they are there but greyed out.

From reading the Apple forums, I have went to syst prefs and under iCloud selected back to my mac and under sharing checked screen sharing....still a no go!!

Can anyone advise?