Thank you for sharing @Sarge, I was experiencing the same with the installed version. My configuration is saved in WinSCP.ini, stored into the same folder of the app.

Have a nice day.

Luigi

OK, you really meant "site bookmarks". I've expected that you actually mean "saved sites".

This change is tracked here:
https://winscp.net/tracker/1411

Thank you for the feedback.
The answers as follows
- Portable WinSCP completely stored at mounted disk (VeraCrypt) including sites/configurations/logs
- Configuration stored in .INI file (same dir where portable WinSCP)
- Name - WinSCP.ini
- Only previous Site Bookmarks lost. All other config at place.

Making the tests I found the reason !

582 version stores site bookmarks under IP only
[Configuration\Bookmarks\Remote\root@XXX.XXX.XXX.XX]
but
583 version stores site bookmarks under IP AND PORT
[Configuration\Bookmarks\Remote\root@XXX.XXX.XXX.XX:117]

I have edited WinSCP.ini by text editor adding port number - and previous bookmarks are at place !
[Configuration\Bookmarks\Local\root@
[Configuration\Bookmarks\Remote\root@
[Configuration\Bookmarks\Options\root@

So during an upgrade from 582 to 583 users must change it manually.

Where do you have your sites/configuration stored? Registry or an INI file? If INI file, where is it stored? What is its name? Are just sites lost or whole configuration?

Hello !
I use portable version of WinSCP 5.8.2 on Windows 10 32bit, everything is OK.
I tried to replace WinSCP.exe to latest portable one - 5.8.3 RC.
It started and works, but it does not read site bookmarks made by 5.8.2
When I returned 5.8.2 exe back - I see again my site bookmarks.
Seems a bug with 5.8.3 RC portable version, please, check.
Regards,
Serge