Part Painter icon is disabled.
Solution
Open Color Manager and see if "Use Solid Edge Options color settings" is enabled. Changing the setting back to "Use individual part styles" will enable Part Painter.
Notes and References
Hardware/Software Configuration
Platform: INTEL
OS: windows
OS Version: 1064
Product: SOLID_EDGE
Application: PART/SHEETMETAL
Version: V219.0
Function: DISPLAY
Ref: 001-9558473