Yes, @Agastar was correct: the file had 'None' for drawing units.
I set it to Inches and then did a 'Save As' and then it loaded into BCL ok.
However, the drawing still has two problems, one of them major:
1. Minor: While the drawing objects used will work, it is not efficient. The corners are done using very short straight lines. These should be changed to Arcs if possible.
2. Major: The problem here is the drawing scale. The height of this part is 23.3 feet (280 inches). By using the Virtual Laser Machine (VLM) within BCL, I was able to easily see the scaling problem. The picture shows the lower left corner of the part against material that is 4x6 inches.
UPDATE: Once Rulers are added to BCL main canvas, the scaling problem will be seen right away.