Wrong Default Month and Year
My calendar does not default to the current month, day and year.
When you first land on the calendar page, it displays "January 2009" (2009 happens to be the Year Selection Start entered in the setup.
When you click the "Today" button, the calendar displays "January 2009" but the url ends with "mo=09&yr=0000"
When you click to advance a month, the calendar shows "February 2009" and the url ends with "mo=2&yr=2009"
At no point does the current day highlight even though Highlight Today is selected in the setup.