Hi Wim, yes it does happen with all props.

I just tried it with the box primitive, too. I changed the OriginY (from 0 to 1), saved the prop as well as the scene, and closed Poser.

Reopened Poser, loaded the box - OriginY = 0.

Closed Poser, loaded the saved scene - OriginY of the box = 0.

 

@ Laurie: Do you mean Edit -> Memorize -> Element? I tried that, too. Didn't seem to have any effect.