FBWF and DUA.

Hi everyone,
one question regarding the union of FBWF and DUA; I have a device with FBWF
enabled and DUA; the FBWF protect all folders except one, suppose named
c:\unprotected; when DUA starts to copy files from the remote http server,
succesfully download and copy all files that are in protected folders but
can't copy files that are in c:\unprotected ! DUA request that files
indefinitely (if I don't use the abort flag in the dua script), server send
it but DUA can't copy file. The strange is: by exploring c:\unprotected I
don't see the file but if I commit that file to the unprotected folder with
the fbwmgr /commit command, that file magically appear and remain in the
folder accross reboot! Have someone the same problem? How can I solve it?
Tanks in advance, Andrea Valori.