In the attached image, you will see that my Standard Brush has a ribbed appearance, even at high resolution. The image shows a standard sphere subdivided to 2 million polygons. The ZBrush environment is the default environment, as it is a new installation of ZBrush 4r8. The stroke is a simple test stroke using the Standard Brush with all of the default settings. While the stroke looks generally ok, you will notice that there are a series of semi-circles all along the stroke (hence the ribbed appearance).
Why does the stroke looked ribbed? It is as though the stamp spacing is off slightly.
My computer specs are as follows:
Windows 10 Creators Update
Intel i7 5960X (8 core, 3.0 Ghz)
64 GB RAM
(2) NVidia GTX 1080 Ti (11GB VRAM each). These are not configured in SLI mode.
Cintiq 27 QHD
Any help would be appreciated.