When loading a project created in Storyboard Pro 2, which contains Final Draft scripts, it may take a while to open the first time in Storyboard Pro 4. When this happens, select the Storyboard view to display the Script. Again, it may some time to open. Once the script is loaded, scroll all the way down the bottom of the script and save. The next time you open the project, it should open normally.
Storyboard Pro 4