Cubase LE4 audio mixdown has no sound

It is a brand new problem I just started to have. Locators are in the correct positions, record is disabled and the little speaker button is disabled also on every track. the settings for the Tascam interface outputs have not been changed. Everything is the same as it was for years. But the last two days, all audio mixdowns come out with no sound. I tried an old project to see if it was perhaps some different things than with the new project…no luck.

Please help!