I upgraded a site from D6 using the instructions for the Migrate, and it appears that the thousands of posts in my private groups are now public, and visible to anonymous users. I added the Group Visibility field to the private groups, and set it to private. Visiting the group page now says that it's private, but all the posts in those groups are still public and visible.
I added the Group Content Visibility field to the group content type, and set it to private for one post, which did make that post private, but do I have to do this for each of the thousands of private group posts? Shouldn't setting the Group Visibility to private make all the posts in that group private, too?
I've searched the issue queue and found a number of issues relating to visibility, but none of them that I could find addressed this question.