John Peterson wrote:

It affects 4.3.7-1679, not 5.0.6-2074.

OK. It got fixed by upgrade of the IDE (and associated libraries) for 5.0 beta. I cannot propagate the fix to 4.3.x branch easily.

The bug has been added to the tracker:
https://winscp.net/tracker/844

It affects 4.3.7-1679, not 5.0.6-2074.

Sorry, I'm lost. You wrote "Latest version 4 and 5 HAS a problem"...

Just to be sure, by :latest version 4", do you mean 4.3.6? And by 5, the 5.0.6 beta?

That's correct. It doesn't affect version 5 as I previously wrote.

Can you give me more details?
I've tried this:
1) Drag WinSCP main window to the edge of the desktop
2) Minimize WinSCP main window (clicking the minimize button on the window title bar)
3) Restore WinSCP main window (clicking WinSCP taskbar button)
It worked correctly. WinSCP main window was restored to the snapped position.

Latest version 4 and 5 has a problem with Windows 7 automatic window arrangement (<invalid hyperlink removed by admin>). [Correction: it doesn't affect version 5.]

Returning the program from a minimized state undoes the window arrangement.

This may be from an unnecessary SW_SHOW (MSDN: "SW_SHOW ...displays it [the window] in its current size and position.").