I think the picture shows a problem I had with a project based on Miika’s Tutorial. The smoke (fire) has a different scale in the render.
It seems to be caused by creating a cube mesh as a domain and scaling it up in Edit Mode. When I created a new cube mesh, and scaled it in Object Mode the rendered smoke was scaled correctly.
This is weirdly similar in description to a bug with particle scale which I posted about (thanks to arexma for reporting it), but it can’t be the same problem. Is this a bug, or have I misunderstood something?