Why isn't my wifi not working since 4.4.4 update?

My Galaxy S5 no longer has wifi capability. Internet; games; email... nothing works on wifi anymore. Not at home or work or elsewhere. I've reset the phone and my home modem but that changed nothing. My 3 laptops and my tablet running 4.2.2 all still connect to the various networks and work as expected. The S5 is now virtually useless. It says it's connected; it shows bars and the up/down arrows blink, but webpages don't load; email doesn't send or recieve, etc.

Anybody else?

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