Bootstrapped persona photos (Peter Klang, Sara Byrne etc.) are not displayed in the Preview as Visitor app. The photos are still in the system since they can be viewed in the Personas app. But the preview app doesn't find them.
If you upload a new photo for a persona then the Preview app shows it. The issue appears to be limited to the bootstrapped photos.
Persona photos are an important visual element that shows well in demos. Missing photos lack the wow-effect.