#394 Retracting a booking causes Authentication Required message

[Anonymous]

Plone 3.3rc2. When trying to retract a booking I get a pop-up:

"A username and password are bing requested by http://intranetsite.org. The site says:"Zope"

Plone is setup to authenticate through Active Directory and I am logged in with Manager credentials. If I go through the Advanced options (where you enter publishing date and expiration date) I can retract the booking from there without problems.