Hello All,I don't know when this started, but it may have been after an upgrade to v2.4 of the API. It's the only thing I can think of that has changed. Server is v10.xI have a featurelayer that has stopped working. <esri:FeatureLayer ID="ParcelMapTipLayer" Opacity="1" OutFields="OBJECTID, ASMNTNUM" Mode="OnDemand" Visible="True" Url="<removed>" Renderer="{StaticResource ParcelToolTipRenderer}" MouseEnter="FeatureLayer_MouseEnter" RendererTakesPrecedence="True" InitializationFailed="FeatureLayer_InitializationFailed" Initialized="FeatureLayer_Initialized" > <MapTip Xaml Removed/> </esri:FeatureLayer>It initializes; I can see in Fiddler it retrieves the initialization data just fine, and the Intialized event shows all is well. The problem is that it's never hit again on any map navigations. This is driving me nuts. Does anyone have any ideas as to why it may not be being called to refresh? Even if i set it to a different Mode from OnDemand (which has always worked) nothing changes.Lance