I use Mac OS Mojave and just recently installed MoI v4 beta Feb-27-2019 because the one from autumn 2018 expired.

None of the buttons in the option dialog like "Lightning options", "View angles" or "Axis label options" works. When I click on them nothing happens. But when I click edit .ini file all the subwindows appear and the option dialog window works until I close it and open it again. I attach a screenshot of what I see when I first click "Lightning options", "View angles" or "Axis label options" (and nothing happens) and then "Edit .ini file".

I'm pretty sure this worked in previous betas.
-Martin