Been having crashes upon launch as well. Tested, did uninstall/reinstall, and even just updated to new Public Beta 3. Here's what I've discovered...
When I am logged into a basic account that is direct through Evernote's login system, all is GOOD and does NOT crash.
When I am authenticated through my GOOGLE account on a PREMIUM account, it crashes on startup.
Something to do with Google authentication (login with Google) and/or Premium Accounts?
For the record, I am on iPad Pro 10.5", iOS 11 Public Beta 3
I really hope Evernote can update to make this work. It's the