So...The Font (TTSNOTE.TTF) was missing in C:\Windows\Fonts.
I don't know why it is missing after the Sonar update.
I downloaded the Font and the Staff View is displaying notes properly once again.
Thank you "user905133" for the quick response and solution.
After updating to Version: 2025.08 (Build 035, X64), the staff view has changed from typical score notation to a different format. Is there something I need to change to revert back to typical notation?