The post-processing save icon turns red if the post-processing setup is changed. It also turns red if settings in the chart files (all the settings in Plot->Layout->Edit...) are changed, but there are cases when changes in the chart files will not be reckognized, e.g. on File->New and when loading WinMLS. When moving toolbars around or turning them on/off, the setup toolbar does not give an indication that the setup is changed (red icon).