Index: trunk/eraser6/Eraser/SchedulerPanel.cs
===================================================================
--- trunk/eraser6/Eraser/SchedulerPanel.cs	(revision 1950)
+++ trunk/eraser6/Eraser/SchedulerPanel.cs	(revision 1952)
@@ -399,6 +399,7 @@
 			}
 
-			DropTargetHelper.DragEnter(this, e.Data, new Point(e.X, e.Y), e.Effect,
-				descriptionMessage, descriptionInsert);
+			if (e.Data.GetDataPresent("DragImageBits"))
+				DropTargetHelper.DragEnter(this, e.Data, new Point(e.X, e.Y), e.Effect,
+					descriptionMessage, descriptionInsert);
 		}