Upload problem

I check my config with the testfile (fckeditor/editor/filemanager/upload/test.html) it works fine! The file is uploaded in 'userfiles'.
But I can't upload a image. Also I can't creat a folder (mess: unknow error creating folder).
The folder 'userfiles' is set chmod 0777. The server running with PHP 5.1.6. Safe Mode is ON in master value and OFF in local value.

Settings:
In fckeditor/editor/filemanager/browser/default/connectors/php/config.php
$Config['UserFilesPath'] = '/userfiles/' ;
$Config['Enabled'] = true ;

In fckeditor/editor/filemanager/upload/php/config.php
$Config['UserFilesPath'] = '/userfiles/' ;
$Config['Enabled'] = true ;

In fckeditor/fckconfig.js
var _FileBrowserLanguage = 'php' ;
var _QuickUploadLanguage = 'php' ;

.. any ideas?