Apparently DS has problems with clipping of curved images. 

The higher the amount of curves the more white areas turned up in my clipped bent images.

The apotheosis of this phenomenon I've encountered to-day, trying to clip a wheel by means of two curves, editted into one closed polyline.  I did this mainly to check whether a 100% curved image would produce these above-mentioned white areas as well. Secondly it would saved me quite a 'walk around the circle' using the 'nearest-snap'.

Greetings, Gerard