Hi Klaus,
just ran into an issue with th "prop"-attribute:
I used this feature in having a "over"-triggered preview. Have small scene-preview pictures and - moving the mouse over - a corresponding bigger (half stage width) preview appears.
This is a "no problem" - the bigger preview width and height are ...
For further use in my layout now i have to place a frame according to the dimensons of this previewpicture.
But copying the big previews height into the height of my frame carries NOT the image pixelheight BUT "prop" into the frames height.
I think in most cases you wont have this property but the real numeric value read out...