I also got this problem, but can see the login pagen but don’t log, and can’t access dashboard. When I try to login, I get this message: Fatal error Class ‘WP_List_Table’ not found in …wordpress/wp-content/plugins/nextgen-gallery/admin/manage-images.php on line 646.
This begins when I tried to deactivate and remove NexGen. After clicked in Remove, the dashboard page didn’t reload, and opened a empty page with only this message (ahead). Now, I can see the login page, but it not opens Dashboar, just a error message. How can I fix it?
Thanks for a help.