I had the same problem on several sites. Disabling the Gravity Forms Add-ons plugin via FTP allowed me to get back into the site. When I tried it on two other sites the same “Fatal error: Call to undefined function wp_get_current_user()” message came up. After doing some searching I found that adding “include(‘pluggable.php’);” as the top line of the wp-includes/capabilities.php file solved the problem, but I do not know if that is the optimal long-term solution.
This is fixed in the next update. Sorry for the issues, and thanks for reporting.
Same problem, I call Godday (my hosting), they found that Digg extension (Digs Diggs), this plugin doesn’t uninstall properly …
look like they fix it, we will see within next days.
I know this is resolved, but I had the same issue last night on a client site. The fix for it was to update to PHP 5.5. The site is on Godaddy and when I checked the PHP version, it said “Native 5.4”. When I changed it to 5.5 – everything kicked in and went back to normal and was running very fast and has been smooth ever since. So check your PHP versions.
Thanks mymothersdaughter! Upgrading to PHP 5.5 seems to have fixed it for me too.
