Default wall Mapping

I am trying to set up a photoworks scene and it seems thatnothing wants to stay at the settings that I put them at. The roomsize has annoying habit of changing back to the size it was when Ihit apply unless I:Change the size, then select resizeautomatically, then click apply, then un-click resizeautomatically, change the numbers again, reselect resizeautomatically, and click apply. Usually that works.

Unfortunally changing the size of the walls changes the mapping ofthe background image to the default value of 19685.03937008in. Theoffset always changes but never to the same number.

So why don't numbers stay where I set them?SolidworksPhotoworks