I was having this issue, upgrading from 4.2.4 to 4.3 did not fix. I did find a suggestion on the forums from a long ago problem and it seems to have fixed it for me. You need to access the .htaccess file in your root WordPress directory. Then just add the following line:
AddHandler application/x-httpd-php5 .php
After that it should work. This line makes sure that PHP 5 is used for the site, seems that something was reciently changed to be sensitive to PHP5.
This worked for me too .. thanks man ?? wish i could send cookies too but i cant so am eating for you !! ??
