My Mate Applications menu is messed up. how do I fix it?

["John J. Boyer" <john.boyer@abilitiessoft.org>]

Hello everyone,

This is the menu that is accessed with Alt+F1. It is skiping around and doesn't show the menu categories properly. it is getting worse. Where is the file that 
stores it? how can i fix it?

Thanks,
John

-- 
John J. Boyer
Email: john.boyer@abilitiessoft.org
website: http://www.abilitiessoft.org
Status: Company dissolved but website and email addresses  live.
Location: Madison, Wisconsin, USA
Mission: developing assistive technology software and providing STEM services 
        that are available at no cost