I'm using a Formidable form to create Wikis with custom fields from CustomPress.
If a Subscriber creates a Wiki in this way the options for "Edit | Advanced | Create New" don't appear. The only way to make them appear is if an Admin opens the Wiki and then updates it. The Admin doesn't need to make any changes to the Wiki at all, the only thing that's needed is to open the Wiki and then update it immediately.
For some reason clicking Quick Edit and then Update doesn't work. You have to actually open the Wiki.
This occurs on a clean install of Wordpress with the latest versions of all plugins and no changes made to the source files.
Admins who create Wikis in this way do see the Edit options when viewing the Wiki. However, logged-in users with Subscriber role do not, unless the Wiki is opened and saved again.