I have a problem with the automatic legend update in ArcMap. After I place a legend to my map, the items in the legend should automaticly response to adding new layers to the map. But it doesn´t work. Or at least, it doesn´t work properly. By that I mean, some layers appear in the legend after adding them to map and some don´t. In the legend properties window, in the "Items" tab, I have checked the "Add a new item to the legend when a new layer is added to the map" line. So it should work.