Hi all. I'm a new iMac user and I'm having a small problem with Facetime. I can reach my son using FT from my iMac, calling him on his iPod touch, but we can't connect in the opposite direction, from his iPod to my Mac. I can see he's trying to reach me as I get the green icon at the bottom for a fraction of a second, but it quickly dissapears. Thanks in advance for your help.