Lancaster Princess, that's a really strange bug. I'll try to look into it.
BTW, I actually do have a "layers" feature. Which ever prop you clicked last goes to the top so if you want to put something on top, just drag it again and replace it. Right now props can't go behind the body, but I can change that
Saving is one of those things that I wanted to have since the beginning, but I just can't figure out how to do it in Javascript. Most scripts that I've seen with saving capabilities use some kind of server for compiling it, but I don't want that because I want the script to be independent from a server.