Integrating applyDefaultSettingsToCanvas resolved the problem. However I had to comment the 'setSegmentationTolerance/Type' statements out since they seemed to have hindered the placement/moving of a point when it was to near the previous pixel-point.
For a better understanding, I assume that 'CachingEnabled' causes this effect (Raster not being 'refreshed' but just re-using the existing image, while redrawing the changed geometry). BTW: what is the cause of the 'blank' screen effect when the raster is being refreshed? Mark Johnson
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