While working in a part file, the toggle in PathFinder that turns sketches on and off was not working.
Solution
It is unknown when this behavior started. To resolve the issue, close Solid Edge and then re-open and the problem should go away.
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: window
OS Version: 1064
Product: SOLID_EDGE
Application: PROFILE/SKETCH
Version: V219MP3
Function: DISPLAY
Ref: 001-9345466