All styles, points, civil 3D objects deleted??????

I was using design center to bring in a ps layout and all my points, styles, surfaces, any smart lines all disappeared. I can't get them back. This error has happened twice to me. Anyone else experienced the same thing? Using C3D 2015 sp3.

Are you saying that these objects existed in the base drawing, and after you imported the layout, they vanished? (From MS?)

Or are you saying that these objects existed in the layout that you are importing?

They existed in the parent drawing and when I tried to DC in a layout they disappeared from my parent drawing, the one I was working in.

This is not a help to how they got lost but can steal from another dwg "Importstylesandsettings"

These objects were in base drawing, import layout from D.C. Didn't work but erased all smart objects and styles. Has happened twice 2 me once to another colleague same base template.