I am using WordPress 2.8.5 and Events Calendar 6.6-beta.
In the Edit Post or Edit Page window, there is the "Publish" box which containts the following info, with an edit link behind each one
Status: Published Edit Visibility: Public Edit Published on: Sep 23, 2009 @ 12:47 Edit
Normally, upon clicking edit, some additional controls and buttons are revealed in order to edit these things.
However, with Events Calendar 6.6-beta activated, clicking on these edit links does nothing.
When the plugin is deactivated, everything works fine.