I had several survey vessel, which where set to auto explore and auto survey. I upgraded them and for the new version i removed the survey module from the ships. The first ship which after the upgrade encountered an anomaly triggered a dialog box saying that only vessels with a survey module are able to explore anomalies. It was not possible to remove the dialog by pressing the done-button, because it reappered instantly everytime. The only solution was to kill galciv from the task-manager.