1. New project.
2. Drop a toolbar or any container (tested with toolbar and window).
3. Drop an image in that container.
4. Set any value in src.
5. Set width ot height to any value say 50, SD reverts to 201, the size of the "no image found" image of SD.
I can confirm that this is not fixed in 410. Upon any reload of designer, my image's width and height is set back to the dimensions of the actual image (or 201/201 if the url is dynamic). Also, if transforming a parent component (e.g. panel to container), the width/height gets reset again.
Thanks for the update - looks like this is one of those bugs that just won't go away. It's actually somewhat worse now!
Blowing away a height or width property immediately sets it back to what Architect thinks the image size is. This is bad for me in a lot of cases. For one, I like to preserve the original aspect ratio of pictures I get while constraining their height. I try to set the height to 150 and the width to blank but when I do, the width gets set to the width of my placeholder image.