When using V 10 I can only access File and Project on the top menus, Help, Hub, VST Cloud, Windows, Workspaces, Studio, Transport and not accessible unless I reboot???
and then they are accessible but only for a short time. When I go to the ‘file’ section it opens the transport
You don’t say what Cubase version you have. If the license is on a USB dongle it may be possible that that USB port used with the dongle is set to auto shutdown to save power. So try changing USB ports or check the USB power settings to ensure the auto shut down function is not active.
If it is not that, then it sounds like a corrupt installation or installation file. I suggest that you redownload and reinstall the whole deal.
Regards. 