My main iMac can't see other airdrop computers
I have three Lion Airdrop capable computers in my house.
My main NEW 27"iMac never sees other computers until a file is sent to it.
Other computers always see my new iMac regardless of whether I am trying to send somthing or not.
What do I need to do to make my new iMac see the other computers.
Bluetooth is seected ON on my main iMac.
P