misteri upload

[madone]

mi chiedo come è possibile che l'upload dei file funzionava fino a ieri e ora non va.. il codice è corretto i permessi chmod sono settati 777 il path è corretto cosa potrei fare?
Ricompilare apache? VVoVe:
Errore:


Codice:

if ( @chmod($_FILES['uploadFile']['tmp_name'], 0777) ){

        if(is_uploaded_file($_FILES['uploadFile']['tmp_name'])){ 
			if (move_uploaded_file($_FILES['uploadFile']['tmp_name'], $_SERVER['DOCUMENT_ROOT'] ."/percorso/". $_FILES['uploadFile']['name']))
//			if (shell_exec("mv -f " . $_FILES['uploadFile']['tmp_name'] ." ". $_SERVER['DOCUMENT_ROOT'] ."/percorso/". $_FILES['uploadFile']['name']))			
			{
				print "File is valid, and was successfully uploaded. ";
				print "Here's some more debugging info:\n";
				print_r($_FILES);
			}
			else
			  { 
				switch ($_FILES['uploadFile'] ['error'])
				 {  case 1:
						   print '

 The file is bigger than this PHP installation allows</p>';
						   break;
					case 2:
						   print '

 The file is bigger than this form allows</p>';
						   break;
					case 3:
						   print '

 Only part of the file was uploaded</p>';
						   break;
					case 4:
						   print '

 No file was uploaded</p>';
						   break;
				 }
				print_r($_FILES);
			}
		}

[madone]

Errore:

Warning: move_uploaded_file(/home/blabla/public_html/percorso/file.txt): failed to open stream: Permission denied in /home/blabla/public_html/file.php on line 22

Warning: move_uploaded_file(): Unable to move '/tmp/phpgGkMX8' to '/home/blabla/public_html/percorso/file.txt' in /home/blabla/public_html/file.php on line 22
Array ( [uploadFile] => Array ( [name] => file.txt [type] => text/plain [tmp_name] => /tmp/phpgGkMX8 [error] => 0 [size] => 1854 ) )