Child Elements don't stick to parent peg (Toon Boom Studio V3)

I am trying to built peg hierarchies in an old TB Studio Version (v3).
My Problem: If I try to move the element in camera view, child elements don’t stick to the parent peg element.

Is this a v3 bug?

Maybe someone has an update link to v3.5 or another solution for this “antique” problem?

kind regards

Peter M.
Bonn, Germany