[Zope] Help! Lost Management interface!

Hi, I seem to have lost the ability to get the management interface of Zope to respond (or do anything). The Zope site itself still responds but when I add "/manage" to the base URL and enter a username and password (correctly) the site hangs. Occasionally I get the manage_top_frame to display, but the other two frames don't display at all. I can enter a subarea of the site (e.g. http://localhost/test/manage) and that works fine, but the Root Folders management interface is non responsive. Any ideas? Thanks, Kevin