Hello/Hi/Greetings,

We installed ver. 12 and now we are not able anymore to activate any plugin... The plugin list shows up on one column only:

https://vm-podcast.csi.it/mlab/PIWIGO_PLUGINS.png

and if we click the activate button for a given plugin, it turns on but it does not work at all. If we refresh the page, the plugin is still deactivated...
We are able to install new plugins, but not to activate them...
The table piwigo_plugins is always empy, no matter which plugin we install...
When the plugin page shows up, browser raised the error: "nb_plugin is not defined":

https://vm-podcast.csi.it/mlab/PIWIGO_ERROR.png

Piwigo 12.0.0 Controllo aggiornamenti
Sistema operativo: Linux
PHP: 7.4.3 [2021-11-08 14:05:20]
MySQL: 8.0.27-0ubuntu0.20.04.1 [2021-11-08 13:05:20]
Libreria grafica: GD 2.2.5
Cache size 0.29 Mo   calculated 1 ora fa

Here is our complete phpinfo:

https://vm-podcast.csi.it/mlab/PHPINFO.png

Piwigo URL: (not a public server, sorry...)

Any ideas? Thank you in advance...