NOTE: 4.0.8 has been released in the App Store to address iOS 13 related issues. 10/7/2019
We had the app working well with the preview release versions of iOS 13 but the new 13.1.1 update seems to have broken things. We are addressing those issues and hopefully getting a new version out soon. In the meantime I would recommend using a device with iOS 12 on it if you have access to one.
We always recommend waiting a bit to update because of issues like this.
This is affecting tons of other apps out there as well. Apple kinda messed this one up.