For me, it crashes when I try to save!
Well, first, I got the typical "Coach Z" crash. That is, after beating the game, I played on the "Extended Play" mode and, when I spoke to Coach Z at the track, the game locked up. (I hadn't encountered this bug before.)
So, the next time I started up the game, I decided to save straight away so that my "Extended Play" saved game would always be present, rather than merely in the auto-save slot (where it runs the risk of being overwritten). Now I've found that it hangs whenever I try to save when on "Extended Play." This didn't happen before! Moreover, when it crashes, it stops the music on whatever note it was last on, usually producing a high-pitched squeal. No buttons respond, including the "power" button; I always have to turn the Wii off by holding the "power" button on the console itself. (The game will crash as the screen displays "Game Saved," but before you actually see the new save file overwrite the old one; and if you start the game up later, you'll see that your old file has not been replaced, and the new file has not been saved anywhere.)
By the way, I've tried switching the Wii to "Standard" rather than widescreen mode, and no dice. The same freeze glitch happens whenever I try to save.
This is weird! Anyway, thanks!