@unclex said:
Can't Choose Materials...
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Did you use the demo file?
The name of the materials that you will use for the section need to start with '_' like '_concrete'
The materials are the standard SketchUp materials that are active in the model.
I see you work with SU 7, at this moment realSection won't work with v7. I hope I can fix the problem with SU 7 very soon.