cannot open sub-folders (on a windows FTP server)

i downloaded smartFTP 2.0.1002 today. It seems that i can connect to all Unix type of FTP servers, however, i have problem when the FTP server is on Windows.
i was able to login and in the home folder. i can also see the subfolders showing on the right-hand panel. however, i cannot double-click on the subfolders to go in. after i double-click, the folder would show a little red dot on the folder icon... is this a known bug? thanks!
The error messages is
[15:44:05] CWD /E Drive/AMD/From_teckwah
[15:44:05] 550 /E: No such file or folder.

below are detail messages/logs...
...
[15:41:00] 331 password required
[15:41:00] PASS (hidden)
[15:41:01] 230 login accepted
[15:41:01] SYST
[15:41:02] 215 UNIX Type: L8
[15:41:02] Detected Server Type: UNIX
[15:41:02] FEAT
[15:41:02] 211-feature list follows
[15:41:02] SIZE
[15:41:02] MDTM
[15:41:02] 211 end
[15:41:02] TYPE I
[15:41:02] 200 Type set to I.
[15:41:02] REST 0
[15:41:02] 502 Command REST not allowed by policy.
[15:41:02] PWD
[15:41:03] 257 "/E Drive/AMD" is current folder.
[15:44:05] CWD /E Drive/AMD/From_teckwah
[15:44:05] 550 /E: No such file or folder.

...

The bug is with your FTP server. Please contact the developer of the FTP server software running on the server.

Regards,
SmartFTP

The bug is with your FTP server. Please contact the developer of the FTP server software running on the server.

Regards,
SmartFTP

however, when we used SwitchIP program, we were able to open the subfolders without problem.
i would find out what FTP server software they are using, however, if SwitchIP works, then smartFTP should be able to handle it as well.