Login does not work af

We are using your plugin [Library-Viewer], and since the latest update, we have encountered two issues:

1. When the plugin is activated, we can’t log into WordPress anymore.
2. On our password-protected members’ area (https://mbc-lehrte.de/mitgliederbereich), the browser gets stuck on https://mbc-lehrte.de/wp-login.php?action=postpass after entering the password.

Would you be able to help us troubleshoot this? Let me know if you need any additional details.

Thanks in advance!