Index: trunk/src/scriptbuilder/gui/panels/IncidentTimelinePanel.java
===================================================================
--- trunk/src/scriptbuilder/gui/panels/IncidentTimelinePanel.java	(revision 117)
+++ trunk/src/scriptbuilder/gui/panels/IncidentTimelinePanel.java	(revision 122)
@@ -243,6 +243,9 @@
                 if (getTopLevelAncestor() instanceof IncidentEditorFrame)
                 {
-                    if (incident.slices.size() == 0)
+                    if (incident.slices.size() == 0 && newSlice != 0)
                     {
+                        JOptionPane.showMessageDialog(g, "This is the first event in the incident.\n"
+                                + "Therefore, it will be automatically positioned at time 00:00:00,\n"
+                                + "relative to the start of the incident.", "Event will be moved", JOptionPane.INFORMATION_MESSAGE);
                         newSlice = 0;
                     }