weird error codes (502 and 426)

ok i am trying to copy some files to my xbox from my pc, i can connect and transfer files upto the letter 'R' over, but once it starts on the 'S' files i get the error. here is my log:

SmartFTP v1.5.991.19
Resolving host name "192.168.1.103"
Connecting to 192.168.1.103 Port: 21
Connected to 192.168.1.103.
220 Please enter your login name now.
USER xbox
331 Password required for xbox.
PASS (hidden)
230 User xbox logged in , proceed.
SYST
215 UNIX Type: L8
FEAT
502 feat is not implemented.
TYPE I
200 Type set to IMAGE.
REST 0
502 rest is not implemented.
PWD
257 "/" is current directory
CWD /
250 "/" is current directory.
PWD
257 "/" is current directory
PORT 192,168,1,101,10,6
200 Port command ok.
LIST -a
150 Opening ASCII data connection for ls /.
226 Transfer finished successfully. Data connection closed.
440 bytes transferred. (N/A/s) (0 ms)
CWD /F
250 "/F/" is current directory.
PWD
257 "/F/" is current directory
PORT 192,168,1,101,10,7
200 Port command ok.
LIST -a
150 Opening ASCII data connection for ls /F/.
226 free disk space under this directory : 64.445.841.408
293 bytes transferred. (17.8 KB/s) (16 ms)
CWD /F/roms
250 "/F/roms/" is current directory.
PWD
257 "/F/roms/" is current directory
PORT 192,168,1,101,10,8
200 Port command ok.
LIST -a
150 Opening ASCII data connection for ls /F/roms/.
226 free disk space under this directory : 64.445.841.408
384 bytes transferred. (23.4 KB/s) (16 ms)
CWD /F/roms/mame
250 "/F/roms/mame/" is current directory.
PWD
257 "/F/roms/mame/" is current directory
PORT 192,168,1,101,10,9
200 Port command ok.
LIST -a
150 Opening ASCII data connection for ls /F/roms/mame/.
286746 bytes transferred. (1.75 MB/s) (156 ms)
226 free disk space under this directory : 64.445.841.408
NOOP
502 noop is not implemented.
NOOP
502 noop is not implemented.
CWD /F/roms/mame
250 "/F/roms/mame/" is current directory.
PWD
257 "/F/roms/mame/" is current directory
Remote file exist check: 'zzyzzyx2.zip'.
SIZE zzyzzyx2.zip
502 size is not implemented.
PORT 192,168,1,101,10,173
200 Port command ok.
STOR zzyzzyx2.zip
426 Connection closed , file opening failed.
CWD /F/roms/mame
250 "/F/roms/mame/" is current directory.
PWD
257 "/F/roms/mame/" is current directory
PORT 192,168,1,101,10,174
200 Port command ok.
LIST -a
150 Opening ASCII data connection for ls /F/roms/mame/.
286746 bytes transferred. (1.75 MB/s) (156 ms)
226 free disk space under this directory : 64.445.841.408
Transfer successful.
NOOP
502 noop is not implemented.
CWD /F/roms/mame
250 "/F/roms/mame/" is current directory.
PWD
257 "/F/roms/mame/" is current directory
Remote file exist check: 'zzyzzyx2.zip'.
SIZE zzyzzyx2.zip
502 size is not implemented.
PORT 192,168,1,101,11,26
200 Port command ok.
STOR zzyzzyx2.zip
426 Connection closed , file opening failed.
CWD /F/roms/mame
250 "/F/roms/mame/" is current directory.
PWD
257 "/F/roms/mame/" is current directory
PORT 192,168,1,101,11,27
200 Port command ok.
LIST -a
150 Opening ASCII data connection for ls /F/roms/mame/.
286746 bytes transferred. (1.74 MB/s) (157 ms)
226 free disk space under this directory : 64.445.841.408
Transfer successful.
CWD /F/roms/mame
250 "/F/roms/mame/" is current directory.
PWD
257 "/F/roms/mame/" is current directory
Remote file exist check: 'zerotime.zip'.
SIZE zerotime.zip
502 size is not implemented.
PORT 192,168,1,101,11,65
200 Port command ok.
STOR zerotime.zip
426 Connection closed , file opening failed.
CWD /F/roms/mame
250 "/F/roms/mame/" is current directory.
PWD
257 "/F/roms/mame/" is current directory
PORT 192,168,1,101,11,66
200 Port command ok.
LIST -a
150 Opening ASCII data connection for ls /F/roms/mame/.
286746 bytes transferred. (1.74 MB/s) (157 ms)
226 free disk space under this directory : 64.445.841.408
Transfer successful.
NOOP
502 noop is not implemented.
NOOP

here is my system info:

+- System -----------------------------
Microsoft Windows XP Professional
Service Pack 2 (Build 2600)

CPU Speed : 2090 MHz
Total Memory : 1048048 KB
Free Memory : 364352 KB

+- SmartFTP ---------------------------
Version : 1.5.991.19
Time Stamp : 2005-11-28 16:35:18

+- Application DLL --------------------
Controls.dll : 1.6.991.19
sfFTPLib.dll : 1.5.7.4
SmartHook.dll : 1.0.2.1

+- Language ---------------------------
SmartFTP.exe : 1.5.991.19

+- System DLL -------------------------
unicows.dll : 1.0.4018.0
shell32.dll : 6.00.2900.2620 (xpsp_sp2_gdr.050225-1820)
shlwapi.dll : 6.00.2900.2668 (xpsp_sp2_gdr.050430-1553)
comctl32.dll : 6.0 (xpsp_sp2_rtm.040803-2158)
riched20.dll : 5.30.23.1221
schannel.dll : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)

+- Internet Explorer ------------------
Version : 6.0.2900.2180

+- Winsock ----------------------------
Winsock : 2.2

i can't figure out while i can copy the same file to other dir but not the one i need the file to be in. i have updated to the latest beta version, and i have tried pas and active mode. Can anyone shed some light on why this one folder is blocking out certain files??