My iMac won't join the correct network

This is a new iMac with Lion.  The network is ok because all my other devices work fine with it.  The network is in the list and when I select it my mac joins without problem, but won't join it automatically.  I've also tried to move my network up in the list but that doesn't seem to work either.

Mine is the only network listed in the Perferred Networks List in the advanced settings.  The "Remember networks this computer has joined" is checked. 
The problem is that when I wake my computer up, it won't find the network.  I updated my airport extreme last week and this problem started after that.  However, none of the other devices using this network are having any problems.

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