Messages Menu Commands Greyed Out
My System is OSX 10.9.2 - Mesages 8.0 (4662) Nearly all Menu Commands are greyed out, including Preferences>General>Buddy List>Account Status, and Buddies>Show in Buddy List, plus Buddies>Invyt to Video Chat>Share my Screen etc, etc. I have updated my Apple Account, signed out, and signed back in, initially entered my iCloud Account, which is the same details as my Apple Account, and nuked the Library>Preferences>com.apple.iChat.plist, all to no avail, so where am I going wrong. I really need to utilise the Screen Share facilities with a friend in Australia, a new switcher to Mac, and this is becoming extremely frustrating.
Many thanks
Neil C
MacBook Pro, OS X Mavericks (10.9.2)