When do flags appear and get removed from tiles on my home page?
The tile images on your Home Page display various icons to notify you of recent changes and additions to your data. Hovering over these icons display additional information.
Additional, the various icons have different rules for removing these symbols from the Home Page so that you are only notified on the most recent or unseen data changes. For the same reason, you will never see icons / hover-overs for commentary that you add, only those contributed by others.
Gold star icon indicating a Favorite element
Notes and Commentary icons
The most recent annotation will be displayed unless you wrote it. The icon will be removed from the tile when you view this hover-over or view the annotation in the Element Viewer. After viewing, the annotation icon will remain on the Element Viewer and Collaborative View, but the icon will be removed from the Tile View