Ralph
Can you send me the .capx, that's a strange issue that i haven't run into, and i've created lots of objects, otherwise i can't help.
So,, it wasnt that problem sorry,, i found its it is happening when u are creating object with CAPSULE physics body,, ,,, if i set it to collider shape,, it works
i've tried it many times with box, sphere, cylinder, use collider shape,,,,, but finaly CAPSULE is wrong
try simply : ON right mouse button : system/create object at ray x,y on ground with CAPSULE set,and create create click click that button to create many objects,, this should be bug