Why is my physics explosive when I load objects in Start?

[Herman-Tulleken]

When I load physics objects (blocks, rigid bodies with box colliders) dynamically from XML in a mono behaviour's Start method, the objects seem to explode when the scene is loaded. When reloading the objects (from a button), they come in fine; no explosive forces.

What can I do to make my objects behave at the beginning?

Edit: Tried to set the positions in the instantiate method as suggested below, but it did not work.

[efge]

This effect could happen when physics objects are instantiated at the same position at the same time (and transformed later).