how to log into wiki on custom domain

I have set up a cname record and set the custom domain to the primary domain.

when I log in at wiki.zoho.com I am redirected to my custom domain but at this point I am not logged in anymore and view the wiki as a public user with no admin/edit options.

I can get to http://wiki.zoho.com/mywiki.do but again any of the menu options redirect to the custom domain and at this point I am not logged in anymore.