WIFI sharing issues.

i've upgraded 2007 macbook new late 2010 air i'm having strange wifi issues.
macbook quite happy share it's internet connection on airport ps3, air isn't quite generous.
settings on ps3 identical, , far can see settings on air , macbook too, using air can see network fine request ip address times out, plug in macbook , fine?

ideas?

curiously i've found macbook happily log onto air using internet sharing via airport, still ps" cannot ip address?

 

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