[support] Bug in D7.2?

Hi,

I wanted to add a calendar to my website, so I downloaded the calendar module. I watched this tutorial (http://www.drupaltherapy.com/date_d7#comment-2114) but for some reason the contextual filter, never shows me the custom date field I created. If I replace the filer by a new one (at that time I do see the custom field I created) no matter what I do I get the error: "The calendar_nav style requires a Date argument."

This bug has been reported earlier on a forum, but supposedly was fixed. I tried various things like clearing the views cache and deleting all modules and enabling them again, but no luck. Surely I'm not the only one wanting to add a calendar to a site. Does anyone have an idea what I might try next?

Regards, Darius