To fix a corrupt settings file you need to go to "C:\ProgramData\Maxima Software\MaxCut" (note that ProgramData is a hidden folder, for steps to enable windows to see hidden folders click here) and delete the settings.xml file. Then open MaxCut again and re-configure your settings, including all settings under Tools > Options.
We have noticed corrupt settings are happening repeatedly on a few user machines. If you are experiencing this issue reguarly please contact our support team. If we are able to identify the root cause of this issue because of your assistance we will give you a Business Edition License as a thank you.