I am working with a Courthouse Steps Miniquilt and I am on the last dark (4th) and don't know what the last 'line' is for. I have dashes one section away which I 'assume' is the cutting/trim line or joining.
I am sewing in the final strip but there is one more solid line....what do I do?

Without seeing the pattern, I would say the last solid line is the cutting edge of the block.

Maryb I love the quilt in your avatar, would you share the name of the pattern or did you make it up yourself?

could the dashed line be the actual seam alowance? with out seeing the patttern I cant tell either.

http://www.straw.com/equilters/libra...bin_part5.html Can you tell from this?

http://www.straw.com/equilters/libra...bin_part3.html
from what i see here, the dash lines are the sewing lines.

I looked at your link, and I am not understanding where you are getting lines at all. Have you drawn a paper pieced pattern and using a paper foundation?
But, then - - I don't see a fourth dark on the courthouse blocks, either.
Some patterns have a solid outer line for stay stitching (usually associated with paper/foundation piecing). <wave>