I'm having a weird issue where 'Clear Sharp' seems to do nothing to edges that Blender half recognizes as sharp.
I have a model that does not show to have any edges marked as sharp:
Nothing seems wrong when in object mode either:
But when I render the model without a subsurf modifier, I get this as a result:
And when I go to the Select Menu and hit 'Sharp Edges', those same edges become selected:
However neither doing so from this selection nor selecting all will clear them if I do a Mesh > Edge > Clear Sharp
Before I discovered this was the case, I thought something was just wrong with the normals, but smoothing vertex/edge/faces did nothing and neither did recalculating normals or checking auto smooth or adding an edge split modifier. I'm not sure what else to try.
Here's the blend file: https://www.dropbox.com/s/9h6arxu9fn74yrm/SharpEdgeProblem.blend?dl=0
edit: A few extra things to note: this topology was the result of the add-on RetopoFlow 2.0, but I have had this issue before with a different model simply by importing an OBJ file and deleting edge loops.