When running multiple blogs out of one MTOS4 installation, how can I prevent users from discovering the other blogs that are running in this installation? Currently, they only need to click on a link in the admin interface (mt.fcgi, in my case), and see a list of all blogs. They should neither see the link, nor be able to execute the function, although they should have almost all powers in their own blog (see other post).
Reported on Movable Type 4.2

Did you give users privileges on other blogs? My wife has an account on my installation of Movable Type, but she only has privileges on 3 of the blogs there, out of about 50 blogs, and can only see the 3 that she has privileges on.
Nope. I thought I'd nailed permissions down, but then I was told by a user that he could see other people's blogs. He could not do anything with them, but find out that they're there. Which is enough of a problem in my case. Like eg. trying to serve sites for both Republicans and Democrats... you get the idea.
Is there any... ***any*** role assigned to those users on other blogs? There has to be something like that happening because when I log in on my own copy of MT as my wife, she cannot see the other blogs. What roles have you assigned to each user?
I'm currently not sure that the problem was valid and come back when I hit the problem next time. Sorry.