I have been playing LSL6 for a few hours now and Art and his cart seem to be broken. I hear the cart on the last screen to the left before going outside, and one time they floated down from the upper right portion of the screen, turned around, and then floated (facing left again) to the upper left of the screen. Has anyone else experienced this and is there a fix for it?

Yes I'm having the exact same issue. I was hoping I wasn't going to have to reload a previous save. If I do I'm going to have to replay a large chunk of the game. Bummer.