Okay, so the lesson I learned today is that even though a drawing looks like all the lines are closed, and even though EstlCAM recognizes and accepts it as closed, it may not actually be closed.
I have three files with errors (open lines) in the text section,. The text originated from someone else, and I simply resized and copied it into my blank strut template. I need to expand my skill set in the future to be able to figure out how to create the text sections myself, and how to connect the unconnected parts of the text sections that I already have.
Because I am currently able to accomplish what I want (which is to cut the struts on my LR3 using EstlCAM) by manually inserting the files and moving them around in EstlCAM, I will probably just continue on without trying to correct the lines at this time. If I come across an easy and quick way to fix the open vectors on all of the files, I may go back and try to sort that out and make it “correct” .
What I do know now, and will apply going forward, is to ensure that any drawings that I create myself have all of the lines fully connected (even if they look like they already are). That way I can use Deepnest to lay out and optimize the various parts on a single sheet.