Problems with browsers & DNS, but other apps work fine

My computer woke from sleep this morning with an interesting issue.    Some applications weren't connecting to the net, saying they couldn't find the host name (all three browsers and a chat program).   But, other programs like my email program connected to the network just fine.    iphone through the router also connected to everything just fine as well.
Changed DNS servers from google to comcast, and got the same issue, which is strange.    Didn't get a chance to restart yet (had to get to work).   If a restart doesn't clear this out, I'm not sure what to tinker with after that.    Thoughts?
i7 "Santa Rosa" imac 27". 
Latest rev of Snow Leopard.  Last update was the security patch 2-odd weeks ago, and worked fine after that.
airport express (lastest software) connected to cable modem.
- John Mc

Hello:
You might try the connection doctor to see if it helps.
I had a problem sometime ago and used Open DNS to resolve it, but I do not know whether that will help (my problem went away when I changed ISP, so I removed Open DNS).
Barry

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