Hmmm, well I don't know why you'd have that same problem as 3.0 using version 3.1 ...

Here's something you can try though - try installing the latest system XQuartz which you can get from here: https://www.xquartz.org/ , then set MoI to use that system installed XQuartz instead of the one that's bundled along with it.

To change the setting in MoI to use the system XQuartz, right-click on the .app and choose "Show package contents" and run the Wineskin.app that you will find in there. Inside there push the "Advanced" button and then on the next dialog go to the Options tab. Then the settings to change are the bottom 2 checkboxes on that page - uncheck "use wrapper's quartz-wm" and check the "use System XQuartz" and see if that makes any difference.

- Michael