Hello,
I was running into the same issue on a Windows 11 machine with Scilab 2025.0.0. My first thought was that the missing Xcos files (zcos) after saving were related to the Windows/Microsoft cloud folders.
But I could reproduce the issue as well on a Ubuntu 24.04 with Scilab 2025.0.0.
Not sure if this is related, but when clicking on “Save” (floppy disk symbol) in the Xcos schematic view, a “.ssp” is being added to the displayed file name for every click, but the file is not saved though.
Thank you for any help/hint to resolve this issue.