Chromebook does not show the app page

A friend has two google accounts and one chromebook. Neither google account will display the app page on the chromebook. Prolly not helpful, but included is a screen capture of the message.

screen capture showing the "Page Not Displayed" message

Logging into any other computer using either of his two google accounts does properly display the app page. Logging out and in on the chromebook doesn't change things. Clearing the cache on the chromebook doesn't help.

I've asked him to check his proxy settings, and to have a friend try yet a different google account.

He's stumped, I'm stumped--are you? What would block the app page on a chromebook straight out of the box?

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