Blank page after new installation

No need to reinstall. Just try to load the management.php file again, and see if you have errors in the log

Thanks, I tried that and nothing was written to the log.

(I checked the log was getting error messages beforehand.)

Could you please try to set $development to true in the config.php of your Xerte installation (around line 43) and then try again?

[06-Apr-2022 15:00:50 Europe/Berlin] PHP Fatal error: Uncaught Error: Class 'Xerte_Authentication_Abstract' not found in /usr/www/users/intoue/xerte/library/Xerte/Authentication/Db.php:34
Stack trace:
#0 /usr/www/users/intoue/xerte/library/autoloader.php(32): require_once()
#1 [internal function]: _xerte_autoloader('Xerte/Authentic...')
#2 /usr/www/users/intoue/xerte/library/Xerte/Authentication/Factory.php(48): spl_autoload_call('Xerte_Authentic...')
#3 /usr/www/users/intoue/xerte/management.php(177): Xerte_Authentication_Factory::create('Db')
#4 {main}
thrown in /usr/www/users/intoue/xerte/library/Xerte/Authentication/Db.php on line 34

Hmmm... That certainly is the cuase, but I have at the moment no clue what could cause this.

Basically it complains that it cannot find the file Xerte/Authentication/Abstract.php or that there is something wrong with it (wrong permissions).

What version of PHP are you using? I really do not understand. Any other errors in the log?

Solved! Xerte/Authentication/Abstract.php was missing for some reason. I've uploaded it and can now log in.
Many thanks!