I use the Date Added column all the time in my iTunes, so I can see what was added last. Well, I just noticed that most of the 10,000 songs in my library have at some point lost the original 'date added' they used to have. Now, the earliest date is sometime in February of 2010. And some have been set to just a few days ago. How did this happen? Is this a bug of iTunes 10? I only just noticed this, so I'm not sure when it happened.