I can't get Back to my Mac to work properly. In theory, my setup should make the process seamless. My home computer is connected to an airport extreme base station. All appropriate types of connections are active (NAT, etc). So I tried connecting from a wireless hotspot. Didn't work. Then, I tried connecting from a friend's network. My home computer wasn't immediately recognized. I had to sign out of .Mac and sign back into it 3 or 4 times from system preferences before my home machine showed up in the finder (I did some research and found that this helped). Unfortunately, upon clicking my iMac in the finder, nothing would happen. Then, after a few minutes, I'd get a message saying "Connection Failed". Screen Sharing was also a bust. I tried this on another network. Didn't work. I should add that I file and screen sharing work great while on the same network. It's just Back to my Mac. Anybody have experience making Back to my Mac work?