In 4.5, it seems, a character preset (one which loads an instance of Genesis) must be of type “Actor” in order to appear without Genesis being selected. Assets of type “Character” only appear when Genesis is selected.
I tested it with my Mr Hyde (which I haven’t updated). The Mr Hyde preset is labelled with the type “Character”, so it only shows when Genesis is selected, although it loads Genesis. I used the Content DB Editor to change the type to “Actor”, and now it appears at all times in Smart Content (and loads Genesis as Mr Hyde).
I think the “Character” type is intended for presets that don’t load a figure but modify an existing instance of Genesis. Those that do load figures should be typed as “Actor”.