Core FTP

I've being using CoreFTP Server and I'm facing an issue.
I'm running it on a WinXP SP2, and the FTP base dir has "full control" permissions for everyone.
Using FileZilla I can connect (SFTP using SSH2), download and upload files and directories.

But I can't delete dirs.
I can create and rename folders but when I try to delete them the server answers "permission denied".
In the user settings on the server all the permissions are enabled, including the "inhert for subdirs".

I can delete files, however.
Windows treats every dir as "read only", maybe this has something to do with it.

Any help?

I see no error message in the log:

[#1] [20060802 18:29:54] [150.162.165.78] gag, mkdir '/New folder'
[#1] [20060802 18:29:57] [150.162.165.78] LIST success - /New folder/
[#1] [20060802 18:30:00] [150.162.165.78] LIST success - /
[#1] [20060802 18:30:00] [150.162.165.78] gag, rmdir '/New folder/'
[#1] [20060802 18:30:03] [150.162.165.78] LIST success - /
[#1] [20060802 18:30:09] [150.162.165.78] disconnected (gag)

This is from FileZilla:
Command: MKD New folder
Response: Directory created successfully
Status: Retrieving directory listing...
Command: CD /
Response: Remote working directory is now /
Status: Directory listing successful
Command: RMD /New folder
Response: rmdir /New folder/: permission denied

The only permission not enabled is "execute" for files.