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Winscp reports "user-mapped section" error. What is this?

I have just started testing winscp 4.2.6 and have experienced an intermitent problem when fetching via SFTP. The winscp log reports -

. 2010-03-04 15:48:11.342 File: "/SOURCE/TEST3.SFTP.TXT"
. 2010-03-04 15:48:11.342 Copying "/SOURCE/TEST3.SFTP.TXT" to local directory started.
. 2010-03-04 15:48:11.342 Binary transfer mode selected.
. 2010-03-04 15:48:11.357 Confirming overwriting of file.
* 2010-03-04 15:48:11.357 (EOSError) System Error. Code: 1224.
* 2010-03-04 15:48:11.357 The requested operation cannot be performed on a file with a user-mapped section open

I don't understand what this error means. This transfer is a simple fetch in a loop and works okay for a while but then hits this problem. The purpose of the test was to see how reliable the process was for stability.

I am sending you a copy of the full log (SFTP_FETCH_20100304_154809.LOG) via email.

Can you advise what this error means and how I might manage it please?


OS Windows Server 2003
Current version of winscp = 4.0.6
Testing version = 4.2.6
Methodology: Scripting/automation
SFTP site: Titan run site supporting SFTP only.

Session protocol = SSH-2
SSH implementation = 1.82 sshlib: sshlibSrSshServer 1.00
Encryption algorithm = aes
Compression = No
File transfer protocol = SFTP-3
Server host key fingerprint
ssh-rsa *****************************************************************
Can change permissions = Yes
Can change owner/group = Yes
Can execute arbitrary command = No
Can create symlink/hardlink = Yes/No
Can lookup user groups = No
Can duplicate remote files = No
Can check available space = No
Can calculate file checksum = No
Native text (ASCII) mode transfers = No
Additional information
The server does not support any SFTP extension.