Index: /issm/trunk-jpl/src/c/datastructures/DataSet.cpp
===================================================================
--- /issm/trunk-jpl/src/c/datastructures/DataSet.cpp	(revision 23547)
+++ /issm/trunk-jpl/src/c/datastructures/DataSet.cpp	(revision 23548)
@@ -438,4 +438,9 @@
 			id_offsets[i]=i;
 			sorted_ids[i]=objects[i]->Id();
+
+			/*In debugging mode, make sure Ids are ACTUALLY sorted...*/
+			#ifdef _ISSM_DEBUG_
+			if(i>0) _assert_(sorted_ids[i]>sorted_ids[i-1]);
+			#endif
 		}
 	}