Attempting Tethered Capture Triggers Spinning Beachball

I'm getting back to some photography after a few years break. I had used Lightroom Classic in the past but am having trouble currently. When I select File / Tethered Capture, modify my settings, and then hit "OK", the application just goes to an endless spinning beachball. The application is non-responsive and I have to Force Quit.

I've done some surface digging and I do have "Use Graphics Processor" turned off. Beyond that, things started to get over my head! I really appreciate any and all help (even if that means a recommendation to use another software for tethered shooting)!

My setup:

Canon 5D

Mac Pro (Late 2013)

2.7 GHz 12-Core Intel Xeon E5

AMD FirePro D700

Sequoia 15.5

* About a year ago, a tech savvy friend helped me get this older computer set up with OpenCore so that I could get my OS up past Monterey. It's been working great but maybe there is an issue here.