Sketch curve color not using the defined color set by Sketch Preferences.
Solution
Make sure In Sketch Preferences dialog, under the Sketch Settings tab, the "Display Object Color" is not toggled on.
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: window
OS Version: 764SP1
Product: NX
Application: DESIGN
Version: V10.0.3
Function: SKETCHER
Ref: 001-7416890