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