No, that didn't help. I don't think it is a reception problem in that the Mac's don't have any trouble finding the AP, regardless of the channel. I think my problem has something to do with the way the security key is handled since the updates. I guess I could shut off security altogether, but that's dangerous. I could scale back to a WEP key, but that isn't very secure and would involve reprogramming all of my WiFi devices, including those that are working OK with WPA. Probably something obvious, but I just don't see it. I could replace the Airport with some other make AP, but it works so well, at least it used to, that I hate to give up on it. One thing for sure, the next time there is a software / firmware update, I think I'll pass. This is costing me a lot of time.