How come when I use the back button on the browser, my settings to the HYSPLIT Model Setup form are returned to the default settings?

This usually occurs when the browser tries to automatically cache the web pages. Try changing your browser settings for the cache. In Internet Explorer, under Tools/Internet Options, change the Temporary Internet files to Every time I view the page. In Netscape, under Edit/Preferences/Advanced/Cache change the Document in cache setting to Every Visit to the Page. Then rerun the model.