Under Engineering Libraries, different libraries show up with a lock next to them and they cannot be edited.Problem ID#: 48926
The lock symbol means that the particular engineering library is read-only. This could be due to the respective library's .XML file being stored in a location that you do not have write permissions to, or it could mean that the program was not run as administrator and therefore does not have access to modify the engineering libraries because they are not contained within the user's Windows profile. You can note the path to the file in the properties of the respective XML file in the Engineering Libraries dialog.
If you have admin rights on your computer, try closing the OpenFlows product, then re-open it by right clicking on the shortcut and choosing "Run as Administrator".
In some cases this could be caused by a problem with the means that the library files are missing. In this case, try deleting the engineering library registry.