My turn. I have recently finished this DXF for a big part 1220 x 2440 mm ( Maybe the part size is way too big for LC yet ?)
I thought I would give LC a true test, I want to prove how well it works by showing something that it cut.
Unfortunately the file is not displayed in the view window, but is shown in the settings windows far right.
If you want another DXF to tes you can try this one. I am not asking for a fix, I have an alternative method, but just thought you might be interested.