Found what might be a fix, would love to know if 3.1 works on your monitors if you have the chance to test it.
I'm able to leave Thicketon in the Mac build of 3.1. The reroll indicator seems to still be layed out relative to the window dimensions rather than the viewport (screenshot , ^1) but that doesn't affect playability.
PS, I see that you uploaded a new build of Perilous Night too. I didn't mention it before, but Night also seemed to be affected by a similar issue, and it seems to be fixed by your latest build. Thanks!
^1: The out-of-viewport fill pattern is the same in all PowerQuest games, and I've decided to assume it's a feature :D @PowerHoof