[KevinH]

My guess is your script AHK is the culprit. Sigil always starts up with Preview showing if checked in View unless you have detached it and possibly moved it to another monitor.

It works like that from the X or using File Quit. Closing Sigil is when the settings are updated. So the settings that are remembered are when you close the very last open Sigil MainWindow if you are on a Mac or you have multiple instances of Sigil launched on Linux or Windows.

So I would look to see if your script is doing something strange when either starting up Sigil or closing it.