Dockable Modules, Can I save my layout?

Tom, the modules and their locations should automatically save between
sessions. What you describe is not typical behavior. The only thing I can
suggest is to uninstall and reinstall SGP to see if that fixes it. If that
doesn't work then perhaps there is a file that has been corrupted and I
think there is another way to reset things, but let's start with
uninstall/reinstall.