[Plugin: The Events Calendar] pages and posts disappear in admin

I just downloaded the Events Calendar and when I activated it, all of my posts and pages disappeared in my admin panel. All I get is “No posts found” or “No pages found”

A refresh on the site gives me the giant calendar page, posts and pages are nowhere to be found.

Upon deactivation, all returns to normal.

Any ideas what could be wrong?

Using WP 3.0.1
Events calendar version 1.6.4
Theme: Atahualpa 3.4.9

http://wordpress.org/extend/plugins/the-events-calendar/