Windows (all versions)
The main, Cubase8.exe continues to run in the background even after Cubase has been quit.
No hanging or crashing with the quit, but a normal, successful quit.
The Cubase8.exe continues to use around 650 MB of ram.
No amount of time makes it go away (i.e., it’s not just slow / delayed in shutting down, but will forever persist until a reboot or manual end process.)
Multiple sessions of launching / quitting Cubase will create additional, left-over Cubase8.exe instances, each consuming 650 MB.
It’s been confirmed by others here:
Steps to reproduce:
View the result in Windows Task Manager.
Reboot between Cubase launches.
Another possible workaround is to end the task from Task Manager.