When setting up my news category for the CMS for vb 4.0.6, it kept refusing anyone except admins.
So I went to permissions and played around a bit and soon realized that if "can publish" is not checked off for whichever usergroup, they are refused to enter the home page with "you do not have permission to visit this page" or "you must log in" for guests.
This is REALLY annoying, because if I check off "can publish" they can edit, delete, etc my home page stuff and articles....