Shaded edges display as very thick lines on model.
Solution
The reason the shaded edges are displaying as very thick is because the pixel width associated to them is very high.
To resolve this:
1. Select 'File-->Preferences-->Visualization'.
2. Select the 'Line' tab.
3. In the 'Line Width' grouping, select the "Reset to Defaults" button.
Now the pixel range is 1->3 for all line widths. The shaded edges will now display as a normal thickness.
Notes and References
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: SYSENG
Version: V12.0.2
Function: VISUALIZATION
Ref: 001-9533397