Restricted access & events not loading

I have been successfully running Scheduler 2.3 on a joomla 1.5.23 site. Recently I have changed my hostingcompany and backupped the site and reinstalled it. From that moment, when accessing the page (front-end) that displays the calendar, I get a “restricted access” pop-up. Also, events created in backend are not loading and are not displayed in the calendar. Does anyone have an idea how to fix this?

Have a look at scheduler page source code and file the follow line:

scheduler.loadXML(someurl);

where someurl is url to load data in scheduler.
Does someurl’s domain is the same as scheduler page’s domain (including www)?