When using IE9, events in the Google calendar dated January 5, 2012 and beyond do not display. I have checked IE8, Firefox 8, and Chrome 16 and it is working correctly.
An example can be found at: http://www.stcdems.org/contact-action-center/calendar-3/#.TvDYdPJsjTo
Anyone else having this problem? Refreshing the i-frame does not correct the issue.