I've been testing a feature service for almost a month now and all of a sudden yesterday, my layers no longer show up in arcgis online. I tried restarting the service, restarting my server, but it doesn't seem to help. I can access the layers in a web application using the silverlight application, but not arcgis.com. I am collecting data using the iphone app, so i need to use arcgis online. Plus I have volunteers in the field!! Any ideas what is going on? I can share the map with a group if you want to look at the feature layer.