Thanks for reporting this. Second report of the exact same issue on OSX in the past week. Unfortunately I can't seem to reproduce the bug on my Mac Mini running Sierra. But try seeing if the mewnbase-java.zip version works for you? (Unzip and just double click the .jar file to run)
Do you know what model of video card is in your Mac?
Seems like I need to update or fix the wrapper I'm using for the OSX-specific version. Sorry that it's not working at the moment :/