Re: Log file as requested
Thanks for the log.
The initial workaround implemented in 5.7.1 was not conforming to SFTP specification. So it broke compatibility with some other servers.
I had to make the workaround apply for ProFTPD specifically only, since 5.7.2.
See https://winscp.net/tracker/1308
But your server does not identify itself as ProFTPD, but as "netfirms FTP Server Ready". So WinSCP does not apply the workaround.
You should contact your hosting provider to upgrade their ProFTPD server. Or at least re-configure it to correctly identify as ProFTPD.
The initial workaround implemented in 5.7.1 was not conforming to SFTP specification. So it broke compatibility with some other servers.
I had to make the workaround apply for ProFTPD specifically only, since 5.7.2.
See https://winscp.net/tracker/1308
But your server does not identify itself as ProFTPD, but as "netfirms FTP Server Ready". So WinSCP does not apply the workaround.
You should contact your hosting provider to upgrade their ProFTPD server. Or at least re-configure it to correctly identify as ProFTPD.