Apple has given a statement about that “iTunes deleting your music” bug:
In an extremely small number of cases users have reported that music files saved on their computer were removed without their permission. We’re taking these reports seriously as we know how important music is to our customers and our teams are focused on identifying the cause. We have not been able to reproduce this issue, however, we’re releasing an update to iTunes early next week which includes additional safeguards. If a user experiences this issue they should contact AppleCare.
I’m not sure how they safeguard against a bug they can’t reproduce. Weird. Think they know about the bug that keeps showing me “intro to New Found Glory” in the “for you” section?