Google Calendar does not work during past few days (v18.), but still works on another Pc running v15.x..x. Why?

On this PC Google calendar works with Chrome, but not with Firefox, v18.x, my default browser. On another PC running Firefox 15.x.x it works OK, just as it does with Chrome on that PC. Calendar worked fine until a few days ago. What happened? I have cleared cache, temporary internet files, browser history, uninstalled and reinstalled Firefox, checked settings on McAfee, allowed

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