A Bolt Class with variables can't have the inspector fields filled by dragging in an GameObject from Hierarchy for most variable types. However, Hierarchy objects can be selected without issue using the radial button attached to the inspector field.

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*Repro:*

1. Create a project and have Bolt 2 set up.

2. Create -> Bolt -> Bolt Class, click to view this new asset in Inspector.

4. Click "+" under "Variables" to add a new variable. For this example, choose Text as the type.

5. In Hierarchy, Right-Click -> UI -> Text

6. In Hierarchy, Right-Click -> Create Empty, and add component "Bolt Component."

7. Select your component class in this Bolt Component.

8. Click the check on the bolt class variable to enable it. Drag your text object from Hierarchy into this field.

*Expected Result*: The object is accepted by the field.

*Actual Result*: The field does not allow most objects to be dragged in for most variable types.

 
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*Notes:*
- Works fine on Bolt 1.

- Couldn't get a version older than 2.0.0a6 to work for testing.

- Tested and reproducible with: All UI elements (i.e. Button, Text, Slider, Toggle), Light, Particle System, Mesh Renderer, Box Collider, Camera, Sprite, Terrain

- Tested and +not reproducible+ with: GameObject