To clarify:

The purpose of the feature is to interpret the chord sheet using chords that are more common in the style that you have selected. The message is this:

I can duplicate the issue that VideoTrack has where the "complex chords" flash message happens if "Never" is selected in the Arrangement options. I don't think it's actually doing any reinterpretation but we will look into that further. You can avoid seeing the message by selecting "Never" in the "show message" drop down.
PG Music Inc.