I've tried out the ova and there is one snag. The notebook now asks for a admin password at the first boot. So to use this version of the VM, you need to
1. import appliance and boot as usual,
2. Simultaneously press Right-Ctrl F8
3. Enter the admin password on the console running the notebook server
4. Press Right-Ctrl F2 to get back to the browser showing the notebook.
I'll post an updated version without this brain damage later.