Content Types programmatically added to SharePoint libraries not appearing on New menu
This one caused some consternation, I can tell you. As usual, the solution could be found on the great wide web, but it took some digging, so as usual I am repeating it here.
As part of a SharePoint migration we did recently, we replaced a SharePoint 2007 feature that the client was using (which added content types to libraries from a central list) with a mix of content type replication and PowerShell to add the content types to the libraries.
Posted by Rik Hepworth on Monday, April 4, 2011