When i use the Paint tool, the items are displaced in relation to the brush strokes. Why ?

Problem

When i use the Paint tool, the items are displaced in relation to the brush strokes. Why ?

Solution

This happens if the Forest object is rotated or scaled, creating errors when computing the position of the paint area.

To fix it, use F12 to show the Transform Type-in dialog, and set rotation and scaling values to zero. Next, Display->Update in Forest to rebuild it.