I've had this issue before, but never figured out a solution to it that works all the time. A couple updates ago, the problem just worked it self out.
That said, I did have some luck deleting the key chains that contained my wireless information. Also, deleting all wireless network information in Network Settings and then resetting it also led to some success -- but it was also hit and miss.
Currently my problem with Airport is that if I plug my external monitor into my Macbook and then try using the wireless network, the airport card starts going bonkers, hits 80 degrees and times out. Still can't figure that one out.
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