I have the same problem! And I can not solve it!
I got:
Fatal error: Call to undefined function is_admin() in /home/a7725460/public_html/wordpress/wp-admin/includes/comment.php on line 162
But I try to upload the files by a different way (Not filezilla) as I usually do, but it doesnt work!
Do you have any idea of what I can do?
Thanks!
