Hi Simon,
Thanks for sharing your app. How can we replicate the issue? I cloned it, hit Run, and got a login prompt, and no output.
I am happy to help investigate this issue, because if Anvil is misbehaving then we want to fix it. It would really help if you could provide instructions for how to reproduce this issue, so we can get to grips with it!
(A little while ago, I wrote a mini-guide to writing forum questions so they’re easy to answer – some of the tips in there might help!)