How do I get light probes to render properly?

I am doing the Stealth Tutorial on Unity Free, using the "Rendering Path: Forward" + "Mode: Dual Lightmaps" work around for its limited lighting features. (You can find it in the comments of this youtube clip: https://www.youtube.com/watch?v=vgRiWhOOQ48)

This seemed to work, until I got to the tutorial where I began placing 3D models that need to be lit via light probes (i.e. CCTV cameras + player character).

The light probes are active on the appropriate game objects, but they do not render in the Scene View. The only way to make them render in the Scene View is to select the Lightmapping Tab and uncheck "Use Lightmaps" in the lightmap display. If I select the Inspector Tab again, they disappear.

I do not understand what is happening here. I dunno if I've done something wrong somewhere, if the work-around is imperfect, or what. Switching the lights in the "baked_lights" prefab that comes with the tutorial from "baked only" to "realtime only" fixes the problem, but changing them all individually seems crazy + I'm assuming its wrong because they weren't set up that way for the tutorial.

Any help? Is this an 'I'm new at Unity' problem, or is this an 'I don't have Unity Pro' problem?