I've tried a new install in our sandstorm today. Everything is fine, but i can't do any changes on people or the settings? Everytime when i'm leaving a page, all entries are gone. Out of curiosity i also installed Monica via Yunohost and here everything is working as expected. What can i do, how can i support you with logs or technical details?
Thanks a lot for your work!

I don't think I had issue with this before, but returning to my Monica grain, I tried adding two life events, and both said they added successfully but then never appeared on the page, nor appeared in the log of actions taken.

External links do not work within Sandstorm otherwise

Monica offers CalDAV, CardDAV and mobile app support and these endpoints should be made accessible through Sandstorm's HTTP API feature

During the first time setup, the users receive no feedback for a long time until Monica has completed its initial setup. I've heard of users, for whom this setup never actually completes.

Pre-initializing the database does not seem to help, I rather suspect the OAuth key generation steps to take up most of the time. App-specific OAuth is not necessary in Sandstorm and thus, this could probably be skipped entirely.

Source ref: https://github.com/monicahq/monica/blob/78d2c65f24e2cb9b9754738c9a434142f8756792/scripts/docker/entrypoint.sh#L54

Looks like this:

[error] 108#108: *399 rewrite or internal redirection cycle while internally redirecting to "/index.php/storage/avatars/6e2dff9d-fc3b-403c-84c8-04c8d86f20f2.jpg"

I don't even think I uploaded any avatars either.

When I shared a grain with another user, they get a useless login screen instead of a normal sandstorm account

Monica has a 'Invite a new user to access your account' feature -- this should be merged with Sandstorm's grain sharing.

I'm unsure whether the initial setup page should be entirely skipped -- it is currently pre-filled with the Sandstorm user info (which users are free to modify) and allows them to agree to Monica's terms of use.