I have a model that whenever I add the mesh smooth operator, it causes "rips" and jagged edges in the mesh along the symmetry seam.
Is this a known error or a mistake on my end?
I think the reason is that those vertice along the edge are not connected, you can use the vertice tool to connect the vertice on the left and right side.
Yeah, that was the problem. For some reason clara.io refuses to weld certain vertices together. I put the model into blender and it worked perfectly fine.