Thanks for all your suggestions. I spoke with, I think, Alistair today and sent him some screenshots and we tested various zoom settings on my copy of Windows 11.

It works fine at 100% but it breaks at higher scalings. I have an ultra-high-def monitor so I need the higher scalings because otherwise everything is tiny. He said he was going to forward the issue to the developers.

On a positive note I sent a recording of myself playing with Band in a Box to a friend of mine who loves jazz. She thought it was an actual jazz band. smile