I have a custom-built theme for a client. Using the widget version of the calendar, everything works fine except the following:
When you click on a date to see the details of the event(s), the screen fades out as if it's about to load something in a lightbox format, but nothing happens after that. Nothing loads; the screen just remains dim. Clicking it again removes the Thickbox dimming effect, as I assume it should. There is absolutely no information shown though.