Fatal error: Call to undefined function wp_cache_get after update attempt

I think W3 Total Cache or any Cache related plugin is still activate in your site. Try to de-active all plugins manually. Using Database Open Phpmyadmin Database of the website. In the table wp_options, under the option_name column (field) find the active_plugins row. Change the option_value field to: a:0:{} Using FTP or SSH In case … Read more

Blank screen at login/logout – tried everything!

I think is an problem of php code, maybe in your functions.phg of the theme. Start debugging feature in WP and see the error messages. add this to wp-config.php or change the constant in the file. define( ‘WP_DEBUG’, TRUE ); Also i think, read this question and his answers, many solutions for the problem.