IIS6 php5.3 and folder permission

Hi,

After an upgrade to PHP 5.3 it seems that:

- folders uploaded via FTP don't have "write" permission anymore. I mean MODX can upload files into /assets/images or assets/files but it cannot create new folders.

- folders created with mkdir have "write" permission and MODX can create folders

- is_writable reports TRUE for mkdir created folders and FALSE for uploaded folders

The only difference, the server admin sees is that IUSR_NAMEOFTHESERVER is not defined for the ftp uploaded folder and it seems like this is the reason folders cannot be created for ftp uploaded folders.

Is there anything I can do to fix this.

Thank you