Windows 7, Cubase 7.5 latest version, Fireface UCX latest drivers
When I open my old projects, I get no sound. My Fireface is selected as the driver. The way to make this work is to either change ASIO drivers or to select other output ports (3+4) before coming back to 1 and 2.
The strange thing is that the project is playing but I do not even see movement in the mixer.
The solution is the one that I set out above. I then get my mixer back.