I know you've been given the solution elsewhere already, but just so readers of this thread get an answer too and don't just see an error question as the latest comment. Enjoy!
Yeah, made a note on this issue on the main game page. Sadly its a Mac specific error we had go unreported for a long time. To fix this on the Mini-VNs we'd have to spend a few days rebuilding them in Unity to rebuild and release, which is time better spent on the current game development. We might just want to rerelease them someday with all the more recent VN features and improvements, but not anytime soon. It's just a problem they'll have for Mac until then.