This issue occurs because if you don't have write permission for the Adobe Captivate Reviewer application.
Often, the root user who has all the permissions (read, write, and execute) is the owner of any application on Mac OS. So, if you have logged on as the 'root' user, you can load the files into the reviewer app successfully. To load the files into the app, the username must be a member of the application group. Furthermore, the application group must have the write permission for the app and its folders.
Adobe Captivate Reviewer app is based on the AIR security model. This model requires that files are in its folder to provide users access to all components of the file. When you load a file in Adobe Captivate Reviewer, the reviewer app picks up the file. Then it writes it into its folder before opening it in the app. To enable the reviewer app to write the file into its folder, the currently logged on user must have the write permission to the reviewer app and its constituent folders.
Owner, member, group, and permissions
Every application on Mac OS is associated with an owner and a group (called as application group). The owner is typically the root user, but not necessarily so. Any user can be added as a member to the application group.
Both the owner and the group can be assigned with read (r), write (w), or execute rights (x).