This missing Shaaden case is puzzling me, because it shouldn't even be happening at all. Only way to get Shaaden to disappear is that you talk to him AFTER you've FINISHED the Grand Arena, talked to Princess Fancy-Tail and received the power of Ankan and the only way to get to this point is to finish all the previous MAIN quests (Temple of Shadows, Palmenbutten Mansion). It doesn't matter if you haven't finished the side quests, they are unrelated.
If this was a bug caused by my stupidity (which has happened before) it would happen to EVERYONE trying to use their own save! I have looked through the switches and the events and there seems to be nothing wrong - If I could fix this, I would! I can't produce this bug myself.
This is super annoying, and I'm sorry you guys are having problems. I am convinced it's just some RPG maker fuckery, and I hope it doesn't happen again in the future versions!
Enjoy these ancient Muh'kean statues and Kiva's observations.