This was originally posted in the V3 Support forum and thought it might need to be here since it seems to be a bug.
FireFox v3.6.16
Calendar v3.03.03
url to http://www.domainname.com/calendar/index.php
returns in the browser
/home/bransonm/public_html/calendar/ac-contents/lang/.lang.php not found
doesn't matter if you are using the http://www or just http://domainname
Darrel