Defaults set when, and only when, the application is opened

There is a need applications to have default selections when opened, but at no other time (current functionality for 'on open' changes to defaults when navigating between sheets). 

As an example, when opening a Financial application, the default would be the last closed month/year.  As the user navigates between sheets and through selections, the defaults will never be set again, but the initial viewing/opening of the application should be standard.