emilb

FIXED IT!
Here is a screenshot of the problem:
http://lastopp.no/filer/fbc567d1169154d5b4e7e4f7429cfb6e.png

Solution:

Go to your /wp-admin/media.php. Scroll down to line 736 then change
if ( !array_key_exists($checked, $alignments) )
to
if ( !array_key_exists('$checked', $alignments) )

Finally 🙂

Tried uploading all the files again, but it didn’t work.