Today's update addresses an issue with non-ASCII Windows account names.
If you were one of the players getting an error stating "An unknown I/O error has occurred" when running Super Motherload, that issue should now be resolved for you.
If you were encountering this issue, please give the game a try now and let us know if this has resolved it for you.
Thank-you for your patience.
- The XGen Team
For the complete changelog, please refer here
For the current list of known issues, please refer here