Missing “Apps you can add” with custom master page in SharePoint 2013
After you put a custom master page on SharePoint 2013 in Add app page you don't see "Apps you can add" section? Is this is the case you have change the visibility of some sections on the custom master page. Just change visibility of following content holders to true you will see the section again. runat="server"/> runat="server" /> Hope this will help you in someway.