Saw your message just now. I had quickly removed D 2.xxx and installed 1.xxx. It works pretty nice, as far as I can tell. I don't know precisely, but I guess 2.xxx is too unstable compared to 1.xxx, or D1 code in some parts doesn't work with D2. I might have made a mistake when installing D2. In any case, D1 works, and thanks for your help
FWIW, when testing and getting '_D3std6format7__arrayZ', it looked totally unfamiliar to me. And that whole list of errors is what I got with just some very simple code of a few lines.
EDIT: I think I cheered too soon :x I now noticed that upon a new project, I'm getting errors, but when I tested it before on an existing project it worked. On the existing project I switched the project compiler settings from GDC to DMD. Having both installed shouldn't be a problem, right?