Harmony Engine UI Controls Unresponsive

I am trying to use Antares Harmony Engine version 4.3 as a vocal harmonizer plugin. It is properly installed and activated (via Auto-Tune Central). While the plugin is functional, accepts audio and MIDI, and outputs audio, the UI sliders, rotary controls, and drop-down lists are totally unresponsive. However, I can toggle the buttons, like Solo, Mute, De-Noise, INPUT, and Choir, on and off.

The Harmony Engine UI is fully functional and responsive in Cakewalk and Mixcraft 10, so I am assuming that this is a Cantabile-specific issue. This is happening on two different laptops, each running build 4203 (x64) and Windows 11 24H2. I tried going back all the way to build 4160, but no joy.

Is anyone experiencing this same issue with Harmony Engine?

I tried Antares in Cantabile 5 or 6 years ago, and had many problems. I gave up on it.
But, I am now having good results with the AIR Vocal Harmonizer, even in a live performance.

@Corky I need a harmonizer that can intake MIDI notes from my keyboards and create harmonies from those chords in real-time for live performance. I don’t believe AIR supports that.

I’ve tried Waves Harmony, but I am not enamored with the realism of the harmony voices. This (and Antares Choir) are the only plugins in my arsenal of 200+ that will not let me adjust UI controls. It is odd that Auto-Tune Pro 11 works just fine and allows full control of rotary, slider and drop-down controls. Same vendor.