Clearly this is a known bug, and in typical Apple fashion: reboot, delete app, yaddi-yaddi-ya. Nothing works, turning off the privacy setting, zip -- in particular a reboot does jack-squat. I didn't see this one in the above comments, but another aspect is when in another app (e.g., a browser) and switching back to the mail app, you're presenting with a blank screen (again after finally opening Mail and getting your in-basket populated)... hitting the back arrow does nothing, the Mail app hangs for 20-30 seconds or more, before it finally shows back on your screen. Get your S#!+ together Apple, Mail used to one of your more "snappier" apps, now its almost worthless.