I have a single object in both elevation and section.   1.  It appears that the section is actually cutting the object and changing geometry from smooth to faceted, I tested a different smooth object and it was fine when cut, however, 2.  Doing a section cut of the test object resulted in correct first view, I noticed some strange shadow line when zoomed icon the viewport, I changed the line to white, well,  the section view is no longer updatable, red line around the viewport doesn't