I'm having some trouble getting this to work on the Builder theme (by iThemes).
In looking at the source code, I can see that all of my <head> info is intact, but it's missing the initial layout framework - it skips everything from the <body> tag, through the navigation, all the way until hit gets to the calendar code.
</head> <div id="tec-content" class="grid"> <div id='tec-events-calendar-header' class="clearfix"> <h2 class="tec-cal-title">Calendar of Events</h2>
Also tested it on another test site that uses a Builder theme and got the same problem. Tested other premium themes with no problem.