por Cristobal Pino.
Connect via FTP to your public_html folder
look for .htaccess
Download it
create a copy for backup (rename the original)
open it and edit it with a text editor (like notepad , gedit, wordpad, etc)
add the line:
# Use PHP 5.3
AddType application/x-httpd-php53 .php
at the end of the file. save, upload it again
This worked for me (thanks Chris). Cheers