With older projects, especially if they used a different driver/interface… When I load these projects into my current setup… there is no sound! I have to either delete the outputs and then re-add… or redo the outputs for the tracks. This also sometimes causes crashes. just deleting the output in F4 connections.
Outputs are stored with the project. So if there is no output anymore, this could happen.
If you are on Cubase Pro, use Control Room, this is a global settings.