I think that I should change my forum name to @CaptainCoredump. :-)
I downloaded the new iOS CQ app on my iPhone 6+ w/iOS 8.4 (12H143), and updated the AXti.me install on my Macbook to 2.3.6. The CQ app opened to a login prompt, in which I provided the IP address of my Macbook and the CQ role password. After tapping go, the CQ screen started to open and then the app closed before it could finish opening. Whenever I tap on the app icon, the screen tries to open and immediately fails again.
The first thing that I did was ensure that the old V1.2 version was removed (it was). I tried changing the CQ password in the event, but the app still will not load. The last thing that I tried was to delete the new CQ app and re-install from the App Store. Same result, it asked for my IP and CQ password, and then closed up shop as soon as I tapped go.
One thing that I just noticed is that the splash screen is still running after the failure if I double-click the fingerprint reader button. I tried swiping it up to close and re-launching with no change of behavior. When I tap on the splash screen to bring up again, it still immediately closes the window.
FWIW, I have Test Flight on my phone if you want to push out a debug version and gather info on what's happening.....