installation gets stuck at first login
i have been using hubzilla earlier, many years ago, running my own hub and getting quite a bit into the details, including code. now i'm trying to set up a hub again on my digitalOcean VPS using nginx & mariaDB. all installation steps using the web interface completed successfully, but after registering the first account i can't log in, the login form keeps re-appearing.
my details make it into the table 'register,' but the user never gets added to the 'users' table. i see neither relevant nginx errors in the logs, nor from mariaDB. nginx can write to .../store/..., xchan & smarty files are being created, doesn't look like a permissions problem.
i tried to find something relevant by searching this forum, but nothing turned up. seems like there should be an easy solution, but right now i'm baffled. can anyone point me in the right direction?