Since Claris CAD is defining 2 vertices per vertex, this means that a polygon with more than about 256 vertices WILL NOT PRINT. Anything above that limit results in such errors as "Limit check: Curveto", or "The objects are fine, but cannot be printed." or the file will print with the offending object missing.
If you would like to confirm how many vertices a polygon has, select the polygon and select"Show Info" from the Layout menu. The "number of points" corresponds to the number of vertices.
Workaround: Polygons can be unjoined and rejoined into smaller polygons that will print correctly to the LaserWriter.