Google calendar broken in WP

Lately all the instances of google calendar widgets on my websites have come to fail to load any events. I’ve used Google Calendar Agenda, Google Calendar Events, and Google Calendar Widget in an attempt to find something that works. To no avail. Samples of failing plugins are on http://ithacawest.org and http://flcycling.org

I”m assuming that google did something to lead to this failure. But, as usual, I’m open to learning that I’m an idiot and have overlooked some simple solution.

Andrejs