"Ask To Share Screen" Greyed Out in Messages
In Messages, when I am chatting with my brother, I am unable to ask him to share his screen. The reverse is also true (he is unable to offer to share his screen with me). If we click "Video" all the "enable" options at the bottom are checked on both machines. We have done screen sharing in the past, it's how I offer tech support to him. But for some reason it's not working now.
We are both running the latest version of OS X, 10.8.4 and we both have good (18MBps+) internet speeds. I've seen posts involving iChat and earlier versions of OS X, but nothing with Mountain Lion and Messages.
Any ideas on how I can get this working?
MacBook Pro, Mac OS X (10.7)