If you are using Adobe InCopy CS6 and have version 8.0 (with no updates) then this issue will be resolved by updating InCopy to version 8.01 or higher.
For information about which version of InCopy you are using please see the page found here. If you need to update InCopy please see the page found here.
If you cannot click on, or select, text in a document opened in InCopy it is usually because an element (such as an empty text box) has been placed over it. InCopy only has access to the top element in layout view, however it can access other elements in "Story" or "Galley" view. If you need access to a text box that you cannot select please contact your agency.