Isn't this something to do with local rights of the currently logged on user?....

Typically, not having enough permissions to C:\Windows\SetScan.ini will cause issues with scanning settings not saving.... but I've run into this issue in the past, and elevating the rights to SetScan.ini didn't help.  It might be worth a try though.  Make sure that the Windows user you are scanning as has full control to that file.

I am having the same problem. I've already opened a LF support case.

I noticed my end user did not have the setscan.ini file in the directory mentioned. I tried running a repair and a reinstall of the software, but still there is no file there. I found another user in their environment running the same version of LF Scanning, and was surprised to find that they had the setscan.ini file in the directory mentioned. They are able to save their scan settings as expected. I copied their setscan.ini over to the original end user, re-launched the application, re-applied the settings, and closed, but that file was not modified.

I verified the end user is a local admin, and I event went into the C:\Windows\ folder and explicitly granted them full access to that folder, but the problem persists and the setscan.ini file that I copied from the other user remains unmodified.