I have just upgraded to this version. On previous versions, adding multiple copies of an object automatically arranged them on the plater. Now, adding multiple copies places them in the same place (using the Add... button), or overlapping (using the + button) - but the Arrange button doesn't seem to do anything, they have to be dragged and dropped to separate them.

Was this figured out?

I can move the first part, and if I duplicate it, I can move the two parts separately. But if I load another part, I cannot move this new part even if I select it. Maybe that's how it's supposed to work.

Really neat though, moving things around on the plate.