Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Content changes randomly – I have just to start WinSCP without any logging.

Thanks for your response.
Though, this is not what I have asked.
I have asked if you need to login/open the workspace, for the workspace content to differ the next time you start WinSCP. Or if the content changes randomly, even if you just start WinSCP, and close it without logging in.

It changes only when I close WinSCP.
If I run WinSCP and in workspace is only two instances (for example) those two stays in list of workspace until I close program.

Two screenshot from two times I run program.

Does the list of session change only when you actually login (and close and restart WinSCP). Or does it change randomly, even if you do not login (and close and restart WinSCP)?

I use latest version of WinSCP 6.1 on Windows 10.
When I create my Workspace I include 4 hosts and save it.
On next launch of WinSCP, sometimes it show only one host inside workspace, and sometime show two or all of them. I even try to delete it in registry, but after some time it recreate itself and show again all four host.
I know session can be stored inside ini file or registry, but since I didn't find ini file I try to delete registry.