DS rendering black screen

I've got an issue I have never come across before in years of using DS. When clikcing render or doing a sopt render the image is completely black. I'm not doing anything different to normal. I've recently been trying out Shader mixer, that's the only difference, but not when I've opened DS today. I've also been trying to arrange my content (made a separate post about that) so I'm thinking I might have done something there:

Here's a snippet from the log file but it's not helping me much to solve the problem - can anyone help?


Loaded image parquet test1.jpg
Rendering image
3Delight message #45 (Severity 2): S2050: cannot find shader 'background', will use 'null'
3Delight message #45 (Severity 2): S2050: cannot find shader 'defaultsurface', will use 'null'
3Delight message #45 (Severity 2): S2050: cannot find shader 'distantlight', will use 'spotlight'
3Delight message #45 (Severity 2): S2050: cannot find shader 'spotlight', will use 'null'
3Delight message #45 (Severity 2): S2050: cannot find shader 'dzplastic', will use 'defaultsurface'
Finished Rendering

Where should these shaders be located?