Often when I tap my Gmail icon, Gmail opens to one of my recent emails. Not usually the most recent one, which I might understand, but perhaps 4th or 5th most recent. I'll navigate back to the inbox, then go back to my home screen. If I immediately go back to gmail, I get back to my inbox, but if I leave my droid alone for a while, then go back to Gmail, I'm back at that same email as before. What gives?