Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryLoop.cs
===================================================================
diff -u -r4897 -r4902
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryLoop.cs	(.../GeometryLoop.cs)	(revision 4897)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryLoop.cs	(.../GeometryLoop.cs)	(revision 4902)
@@ -142,7 +142,10 @@
     {
         for (var i = 0; i < CurveList.Count - 1; i++)
         {
-            if (CurveList[i].EndPoint != CurveList[i + 1].HeadPoint)
+            if ((CurveList[i].EndPoint != CurveList[i + 1].HeadPoint) &&
+                (CurveList[i].EndPoint != CurveList[i + 1].EndPoint) &&
+                (CurveList[i].HeadPoint != CurveList[i + 1].HeadPoint) &&
+                (CurveList[i].HeadPoint != CurveList[i + 1].EndPoint))
             {
                 return false;
             }