I know this is old, but somehow never resolved. This is what I am facing. The main problem is the Connection Error (Reconnect) popup and NOT the freeze. In fact, the popup is causing the screen freeze.
When I have an active connection open in WinSCP and I put my PC to sleep, after it wakes up the Connection Error popup seems to either freeze the screen and other windows from opening or just shows nothing in popup (see attached screenshot) or both. This gets even more annoying when moving between laptop screen and external monitor. This popup just stops everything from moving to second monitor until either the connection is restored or WinSCP window is closed/terminated. With the white (blank) popup (as attached), I have to kill the process from Task manager. Simply closing the window doesn't work.
All I am looking for is a way to disable or suppress this Connection Error popup on screen, with an option to restart the connection (Reconnect) in the WinSCP Main Panel window or leave it alone. I would appreciate any help on this.