Screen Sharing over internet on OS X Lion - cannot control remote machine I'm trying to connect remotely to a family member's new MacBook Air from my own iMac. Both machines are running OS X Lion.

I can connect to the files on the remote machine and I can see the screen of the remote machine.

But I cannot interact (mouse or keyboard) with the remote machine. 

I can run LogMeIn (free version) with no issues. But I'd like to log in to the machine remotely with no input from the family member - it shaves at least 30 minutes off the support call. ;-)

Any idea what I'm doing wrong?
Most likely you have Observe Mode enabled on your end. In Screen Sharing.app, go to the View menu. You should see an entry for "Switch to Control Mode".