I just got one of the new (April 2010 version) 15" macbook pros. The problem I'm having is that the airport basically stops working if the computer's lid is closed (it's connected to an external monitor). I'm still getting 5 bars of signal, but it's having problem talking to the router. Pinging my router with it open results in about 3-10 ms for every ping. With the lid closed, about a third of the pings time out, and the rest take anywhere from 5 to 2500 ms. According to ifixit, this version of the macbook pro has the wifi antenna next to the cd drive opening instead of the screen -- so the position of the screen shouldn't be affecting the wifi reception. Through my own testing, I have also confirmed that the position of the screen doesn't make any difference. If the screen is open even the slightest amount, it works fine. But as soon as it's closed, the problems start happening. This leads me to believe it's some sort of software problem. Is there anything I can do to fix this, or am I just going to have to wait until Apple releases an update? Update: I'm starting to think this is a hardware problem -- see my post below for more specific testing results.