On Tour has been fixed, but here's another disappearing sales bug game for DS...
High School Musical: Makin the Cut!
http://vgchartz.com/games/game.php?id=7171®ion=All
"[Our former customers] are unable to find software which they WANT to play."
"The way to solve this problem lies in how to communicate what kind of games [they CAN play]."
Satoru Iwata, Nintendo President. Only slightly paraphrased.