It looks like the fix you did for the custom domain sign-out problem is causing a problem with signing out of wikis that aren't custom domain. When I sign out of my wiki, I expect to get taken to the Zoho wiki sign-on page (http://wiki.zoho.com/login.do?serviceurl=%2Fregister.do). That's the way it's always behaved. As of today, when I sign out of my wiki it displays a sign-in box to enter username/password, and when I close that box it is on a blank version of my wiki with a message that I don't have permission to view the page.
Writer is a powerful online word processor, designed for collaborative work.