Under the Group settings for "Who can create a group", I have SocialGroup_Member selected. However, members don't see the "Create Group" option on the Groups page. When I look at the SocialGroup_Member Role, it hasn't been assigned to anyone. So that kinda explains why the option isn't visible.

So how are members supposed to be assigned the SocialGroup_Member Role?

SocialGroup_Member is used as a template for your forum security options. It is never used and members are never added to it. When a new group is created.

You should use the registered users role or the role you have setup under the community role section. Users will then be able to create groups.

Thanks Will.