Information Steward - Data Insight - Add File: not working

In "Information Steward" (version 14.0.1.128) I select a workspace and on the "Data Insight" tab I select the "Add / Files" command. A window is shown and in the left hand column I select a file connection that I have previously setup in the Central Management Console. In the right hand column it lists the files that at in the folder that the file connection points to.

The problem is that I can't select any of the files and import them. The check boxes are disabled.

Anyone know what would cause this to not work?