I have the same problem on my iPhone 7, iOS 10.0.2, Cloud Providor iCloud with the new Version 2.5.437.
I have also reinstall the app, reboot etc. no success, App start and crash. I can't activate the log to send it, sorry.
I hope it's come a new version with no problems. I pay for this service and i have now one week without Boxcryptor.