Cubase Pro 15 latest update. Windows Pro 11 latest update.
When Cubase is open and a project is loaded, all working fine.
Close the project, but not Cubase, open a different project and Cubase closes/crashes.
No Crash Dump file is created.
Open the same project again and Cubase starts and loads just fine.
This has been happening for a while already and finally decided to report it.
Some people have reported this as far back as C9 in 2018, per the Forum.