Then switch to another sprite, then switch back to the sprite you run the script above, things get bunched up together and you can enjoy a weird version of Snap!
This isn't a bug; it's a misfeature. That is, Jens thinks that Turtle isn't a costume, because it's implemented differently from other costumes. (You can tell this because only the Turtle takes on the color of the pen.) And therefore, instead of making sure that the Turtle responds to costume-related blocks the same as other costumes, he wants users not to think of Turtle as a costume. That's also why NEXT COSTUME won't take you from costume 0 (labelled as such!) to costume 1. (Nobody argues that NEXT COSTUME of the highest costume number should rotate to costume 0; of course if the user has a bunch of non-turtle costumes they want to rotate only among those costumes.)
I'm confused, it's a misfeature that the scripts, costumes, and sounds tab buttons disappear? It should just throw an error whenever you try to do this.
I believe it's the same thing as here: Blank costume bug
Happens when you try to switch to a costume with a width and height of zero. That one ended up getting fixed though
did you mark your own post as a solution? it doesn't seem like the poster would considering it's not relevant to the bug
(i'm pretty sure i've seen admins get marked solutions on my topics when i wasn't satisfied with it, i'm not a fan of that especially if you and others are doing it yourself immediately)