ZBrushCentral

Edgy problem

While making a tilable texture, the shading of smooth lines all turned edgy lines I closed the document and reopened it. It’s supposed to look like the image with matcap grey (see attachments)

I’ve restarted zbrush and my computer but no result. The edginess seems to be permanent in my document and have to recreate, this tends to happen after a several saves. Please help?

Attachments

edgy.JPG

supposed_to.JPG