Mac Mini cannot access secure WiFi any longer.

Two days ago, my 8 month old Mac Mini dropped my wifi and would not reconnect.  I have a Motorola router with AT&T U-verse.  I reset router, computer but still kept receiving "timeout" error.  I tried creating a new location, clearing out keychain but that didn't help. 
Eventually I wrecked my network configuration files in Library->Preferences and reset the machine while also resetting SMC (unplug power and hold power button for 15 seconds).  When machine booted back up, I was able to connect again until the first time my computer fell asleep.  The connection could not be reestablished. 
I started toying with the router setting - when I remove all security, I could access the network.  Also, when I set the security to WEP instead of WPA, I could access the network but I was not asked for the key - the network showed up as unprotected which is troubling.
Does anyone know why I can no longer utilize WPA protected WiFi any longer?  I am currently on OS 10.7.4.
Does Mountain Lion address any of Lion's WiFi wonkiness?

Very odd.. kind of thing that Mavericks does though.
What is the router and dns values in the mini cf the MBPs..
The TC should be in bridge so all connections are getting IP from the Comcast router. They should therefore all get the same values.. for router (gateway) and dns.
Check this also by doing a ping to the internet.
Ping your ISP home address. if it does not respond by name test it by IP address. you can pick this up from another computer that does work.
If you have dns issues then simply change the dns to manual setting and use 8.8.8.8 which is the google universal one.
Mavericks is very ipv6 .. I am not sure how relevant but make sure ipv6 is set to link local for both wireless and ethernet connections.

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