Bug Behavior is like this.
1. Import scene. Module color is soft blue.
2. Change to black through settings.
3. Simulate & print report. Modules are in black in shading scene of report.
4. Wait for a while.. may be open a couple of new projects or different simulation variants.. do some simulation.
5. Close PVsyst.
6. Go back to project simulation variant in which module colors were changed to black through settings.
7. Reprint the report.
8. Modules colors are mystically changed to SOFT BLUE again, automatically.