Hey Al, I think I've stumbled across a pathfinding glitch. After running a game in the editor, executing any command utilising a path (such as MOVIE, FILEIO or SPRITE) and then exiting run mode and returning to the editor, GameMaker encounters a problem accessing the temporary game file when I attempt to save.
I don't think it's much of a hindrance to anyone since TD and I are the only ones who use paths (and we can easily amend that), but I thought I'd report it nonetheless.