Than, You are welcome. Not sure what is going on with the Gantt chart format. As long as the day is setup as a non-work day, it should show as a non-work day just like Sat/Sun. Try entering another holiday and see if that shows correctly on the Gantt. If it does then look for differences between the two calendar entries.
Previously you said you got the solution for a, b, c, and d. I was thinking just a quick post here explaining how you were able to solve those items. That’s all.