Dear Adam Kubanski,
We could not access to FTP, but you could check file config.php:
<?php
/** WordPress's config file **/
/** http://wordpress.org/ **/
// ** MySQL settings ** //
define('DB_NAME', 'madeupname'); // The name of the database
define('DB_USER', 'madeupuser'); // Your MySQL username
define('DB_PASSWORD', 'madeuppw'); // ...and password
define('DB_HOST', 'mysql.yoursite.com'); // ...and the server MySQL is running on
// Change the prefix if you want to have multiple blogs in a single database.
$table_prefix = 'wp_'; // example: 'wp_' or 'b2' or 'mylogin_'
In your database, using phpMyAdmin, check that the tables all begin with the same prefix that you have in your wp-config.php. For example if you changed your table prefix to "b2", the tables would be "b2_commentmeta", b2_comments", etc.
Also, you have to check inside two tables to see that certain field names are also changed. So, using the same prefix as above, in b2_options, the field wp_user_roles has to be changed to b2_user_roles. And in the b2_usermeta table, the fields wp_capabilities, wp_user_level, wp_user-settings, wp_user-settings-time, and wp_dashboard_quick_press_last_post_id should all have the prefix b2_ instead of wp_.
And lastly, within your database, look at the values in the wp_usermeta table as follows:
wp_capabilities should be a:1:{s:13:"administrator";s:1:"1";}
wp_user_level should be 10
Thanks & regards!