What did you upgrade? Why do you think that upgrading caused the problem? Can you connect using any other client?

Btw, the timeout can be increased here:
https://winscp.net/eng/docs/ui_login_connection

since upgrading I can't figure out how to login. If i click login without entering my password the connection times out; the initial dialog won't accept my password; if I click Edit and enter my password and save it, the connection still times out. I don't see anywhere to increase the timeout.