Depending on the design of the imported CAD, picking certain surfaces could yield unintended results as described below:
- Inability to select a specific edge accurately
Points vector normal are not consistent across an edge
Points generated from a complex 2D curve have unintended gaps in certain regions
Cannot select certain points/surfaces on CAD
Wrong surface picked (opposite side of part)

Follow the steps below to troubleshoot the issue:
- Browse to the Display ribbon tab
- Select Editor from the CAD group
- Switch to the Surfaces tab
- Click on the Select All button to highlight all surfaces
- Click on the Properties button
- Check the Complex Surfaces option within the Other Properties group
- select the OK button to accept changes
- Re-pick the curve / surface