Check your PHP logs for errors. Something is preventing the calendar javascript files from loading.
I thought of that already. There are no PHP errors in my log files and using HttpFox, the files (custom.css?ver=0.9.9.2, cat_colors.css?ver=0.9.9.2 and jquery-ui-1.8.13.custom.css?ver=1.8.13) are loading correctly. Is there another js file that should be loading?
Right, those css files are loading properly, you are missing all the javascript files. I assume the problem is caused by a collision with either other plugins or your theme javascript, and since you’re telling me you can’t see any PHP errors, it could mean your server is setup to hide errors.
I’ve never seen this before and don’t really know how to help you further
You’re right. I was not calling the wp_footer in my theme. Thank you and sorry for the silly mistake. Great plugin!