Just did an upgrade of WP to 4.2.2.
The SPF (4+) then throws errors like:
Warning: in_array() expects parameter 2 to be array, string given in /var/www/problem-with-post-edit-buttontml/wp-includes/formatting.php on line 342
So then I upgraded to SPF 5.5.8, but it didnt work out (still the warning above, plus some serious styling errors)
Since I have a test enviroment with WP 4.2.2 and SPF 5.4 that works fine, I wanted to downgrade, but saw another post that it´s not possible.

