Calendar Links Not Working

I have a user with the role of editor who has been using the calendar view to access articles to edit and schedule for publication. It’s worked flawlessly for months until now. When she clicks on a calendar item listed on June 2 or earlier, she see the three links to edit, trash, or preview the article. For all articles on June 3 or later, however, the links are gone. Hoping somebody can help with this issue. Thanks.

http://wordpress.org/extend/plugins/edit-flow/