Rendering issue on external monitors - Mac

Using Scaler 2 on Big Sur 11.7.1, Ableton. Issue persists using both AU and VST3

Scaler 2 loads fine on my laptop monitor - but as soon as the plugin is dragged over to one of my two external screens - it turns into the following glitchy image. I turned off Render in OpenGL in settings, and tried to re-size the window. Didn’t make a change.

Any help? Pretty big usability issue for me. Thanks!