WinSCP immediately quits after connecting to FTP (Active 24)

Hi,
I installed WinSCP version 5, and after attempt to connect to ftp on A24 servers, it quits without any message.

Log content:
. 2012-10-11 17:25:50.230 Using FTP protocol.
. 2012-10-11 17:25:50.232 Doing startup conversation with host.
> 2012-10-11 17:25:50.281 PWD
< 2012-10-11 17:25:50.283 257 "/" is the current directory
. 2012-10-11 17:25:50.332 Getting current directory name.
. 2012-10-11 17:25:50.483 Retrieving directory listing...
> 2012-10-11 17:25:50.483 TYPE A
< 2012-10-11 17:25:50.483 200 Type set to A
> 2012-10-11 17:25:50.483 PASV
< 2012-10-11 17:25:50.483 227 Entering Passive Mode (81,95,96,150,116,162).
> 2012-10-11 17:25:50.483 MLSD
< 2012-10-11 17:25:50.483 150 Opening ASCII mode data connection for MLSD
. 2012-10-11 17:25:50.534 SSL connection established
< 2012-10-11 17:25:50.584 226 Transfer complete
. 2012-10-11 17:25:50.635 Directory listing successful
. 2012-10-11 17:25:50.735 Startup conversation with host finished.

Everything worked correctly in version 4.

What up?

Amendment:
Everything works as expected on different FTPs. Only A24 keep WinSCP shutting down ungracefully :?
It doesn't make any difference what protocol or encryption I use, it quits every time.

Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.

Email sent.

This bug has been added to the tracker:
https://winscp.net/tracker/922