The position nodes are currently represented by planar figures. This brings some bad side effects:

• If measurement bundle is active on all planar figures which are present in the data storage a planar figure interactor is register. Next time you draw a contour simultaneously a planar circle is drawn

• The statistics bundle takes planar figures as a mask. Since the planar circle which is used to represent the position node has radius 0 the statistic bundle crashes

Quckfix would be to just ignore planar figures which are contour markers

This quick fix should be removed as soon a own datatype is available for the position nodes.