Mail on iOS 9 on iPad no longer works after upgrading

I've got a 128 GB iPad Air (not the oldest iPad around as Apple still seems to be selling it in their store). I upgraded to iOS 9 then 9.0.1 and the Mail app no longer works. I tried the good ole restart and did not fix. Basically when I touch the Mail app to open it, I get a (totally) white screen, this goes for about 5 seconds before the app quits and returns me to the home screen. This happens over and over again when trying to open Mail. (Mail was working fine previously, prior to so called, upgrade.

What's up Apple?

Please advise.