Try to fix the problem using the new "Dayligh saving time" switch on Environment tab of login dialog.
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I have this problem as well. It started when Europe switched to Daylight Savings Time. I'm in Johannesburg South Africa and we don't use DST. I have checked the timezone offset option of the SCP tag in the login dialog and it's zero as it should be, I'm connecting to a server in the same area as my client. My guess is that WinSCP is trying to correct for an assumed DST offset when there isn't one.Try to adjust DST difference with "timezone" offset option on SCP tab of login dialog.