Generate Harmonies lagging behind chord track

I used Generate Harmonies on a rough vocal track a few months ago and it worked perfectly (7.5.0).

I just re-recorded those vocals and tried to Generate Harmonies exactly like I did before and the result is not following the Chord Track properly (using 7.5.3). All the chord changes are lagging far behind where they sit on the chord track. It’s almost like it’s waiting for silent patches before applying the chord changes, if it does change at all.

I even went back and tried using Cubase 7.5.0, but no difference. Why was it bang-on the chord changes before, and now it doesn’t work? I’m scratching my head, and will start banging it against the desk shortly.