Although I have used EXCEL a lot, this is my first experience with an add-in. I am told to go to the trust center settings, and then Macro settings then select "Enable all macros" and check "Trust access to the VBA project object model" click OK and close Excel. I know that this opens me up to some potential security issues. After I loaded the add-in, I went back and reset these parameters back to the way they defaulted. I am surprised that the add-in still functions after resetting the security access settings. Can I leave the settings this way? Is this what I should do to protect me from other potentially harmful macros? I am using EXCEL 2010.