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When I select a face, the reverse face is selected (PC)

This is a known issue with some OpenGL graphics drivers. We have built a workaround option into SketchUp:

  1. In SketchUp, open the "Window" menu.
  2. Click "Preferences."
  3. Click "OpenGL."
  4. In the "Acceleration" section, select the "Correct reversed picking driver bug" option.
  5. Click "OK."