Sudden change in network settings - can no longer access web sites

All of a sudden, I am no longer able to access any web sites on my Mac Mini. Everything was working fine and then yesterday I tried to get on-line to look something up and it didn't work.
I restarted the computer, checked internet connectivity - which all appeared to be working correctly. When I went to check my System Preferences, Network - I got a message that pops up telling me my network settings had changed but it hangs there and when I click OK, it just hangs. I have to force quit to exit the network settings. The only change I've made recently has been to load Genius to itunes.

I too have noticed that there's a split second after typing return that you can click on something (I've done "edit locations" in the pop-up). It solves temporarily, but seems to come back whenever you reboot or log in.
I'm trying to decide if I have an additional problem or is a further complication: I'm using DSL through ethernet with the phone company. The symptoms of my intermittent problem are that sometimes I suddenly can't receive back web pages or email...loading a page or getting mail will simply time out without response. All other indications, however are that the connection is still good including status lights on the DSL modem and using the network utility to test a URL look up. I might attribute this to the security update bug, but two other machines that connect through the same hub and modem get no action either once this happens (TiPB running 10.4.3 & Prismo running 10.3.9). Is there any chance that the security update on the AlPb with 10.4.11 is blocking incoming traffic by setting something out at the DSL modem?

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