Since January 29, any mail that has come into my inbox and been read and retained won't show on the Gmail app on my Evo 4G. Furthermore, some email that I've since archived remains in the app inbox. I tried changing the sync rate from 4 days to 1 day, but that did nothing and now the menu that allowed me to make that change won't appear. I just want to be able to see everything currently sitting in my inbox. Little help?