I have a weird problem, and internet isn't really helpful on that one.
I have a macbook pro and a wifi network. The macbook pro can see plenty of wifi network around, but very rarely mine.
The wifi network is configured properly as I have plenty of other device seeing it and using it successfully. The macbook pro seems to have issue with this network specifically, as it can connect successfully other network.
My network isn't completely invisible to the macbook pro, and, once connected it work fine. The signal strength is very good. But most of the time, it simply don't show up in network lists, possibly for hours.