He localizado un nuevo error:
[Tue Feb 12 15:01:14 2013] [error] [client 85.84.158.115] PHP Warning: move_uploaded_file() [<a href='function.move-uploaded-file'>function.move-uploaded-file</a>]: Unable to move '/tmp/phpWR6Y24' to 'http://www.evoluzionaformaicon.com/INTRANET/uploads/doc/contrato/marca_errota2.jpg' in /var/www/vhosts/evoluzionaformacion.com/httpdocs/INTRANET/uploads/upload-file-comercial.php on line 15
¿Qué quiere decir?