If I edit a content-type the permissions that have been set on this content-type are resetted. For example a group having nid 122 and having blogs allowed on both of the admin interfaces
?q=admin/og/og_content_types/admin/122
?q=node/122/ogct
If I edit the content-type blog and edit the comment-settings in there and save, then the blog-type gets disallowed for all groups in both interfaces.

I assume this is not intended behaviour, as it requires the admin to edit the permissions to restore the status quo afterwards followed by group-owners having to do the same within their groups. Imagine you have lots of groups and want to change something about the comments ... At the same time I don't see no need for this. So: Bug? Feature?