upgraded ArcGIS Server to 10.3.1 this morning. Most features are working perfect, but I have an identify feature that is no longer identifying all layers and a handful of queries that just return a fault code of 400 (both old flex applications as well as newer javascript applications). I have tried recreating the services and nothing seems to fix it. I'm hoping there is a bug that maybe I have missed? I did install the service pack related to geocoding. I don't really know what else to try except to upgrade to 10.4 which was not my plan.