Why there is no an option in Animation Frames Bar to reload frames from the already loaded image?
Now if I change/redraw sprites on that image and want to update loaded frames then I can only use Import Sprite Strip option and manually delete old frames from the previous import!
By the way, are you going to add options to display grid and snap/align/distribute objects in Layout Editor? Now it is pretty hard to make user interface and place objects in a right position without these options.