Anyone else getting this NSRangeException during starting up?

This is showing up when I start Soundtrack Pro now - I think after loading Mavericks. Is somebody watching? Or what?

NSRangeException

Cannot remove an observer <AudioFileEnvelopeTrackHeaderView 0x10c9a8e0> for the key path "Meter Jack Order" from <NSUserDefaults 0x1064db0> because it is not registered as an observer.