I've got next error: "1 or more of your feeds could not be displayed. The following errors occurred:
Feed 1: Couldn't open descriptor for fopen() to https://www.google.com/calendar/feeds/my_calendar%40gmail.com/public/full-noattendees?alt=json&singleevents=true&sortorder=ascending&orderby=starttime&start-min=2012-12-12T08:02:00&start-max=2037-12-31T20:00:00&max-results=25&fields=entry(title,link@rel="alternate"],content,gd:where,gd:when,gCal:uid) Please ensure your feed URL is correct."
(translated a bit)
WP 3.4.2 have the same problem. After several refreshing everything is OK. But it repeats, and you have to refresh again.
If anybody know what the problem, please, help.