diff --git a/src/db/db/dbCompoundOperation.cc b/src/db/db/dbCompoundOperation.cc
index 0100e561b..65f3778cf 100644
--- a/src/db/db/dbCompoundOperation.cc
+++ b/src/db/db/dbCompoundOperation.cc
@@ -835,6 +835,7 @@ void compound_region_generic_operation_node<TS, TI, TR>::implement_compute_local
 
   const CompoundRegionOperationNode *self = child (0);
   std::vector<std::unordered_set<TS> > self_result;
+  self_result.push_back (std::unordered_set<TS> ());
 
   shape_interactions<TTS, TTI> self_interactions_heap;
   const shape_interactions<TTS, TTI> &self_interactions = interactions_for_child (interactions, 0, self_interactions_heap);
@@ -851,6 +852,7 @@ void compound_region_generic_operation_node<TS, TI, TR>::implement_compute_local
 
     const CompoundRegionOperationNode *intruder = child (ci);
     std::vector<std::unordered_set<TI> > intruder_result;
+    intruder_result.push_back (std::unordered_set<TI> ());
 
     shape_interactions<TTS, TTI> intruder_interactions_heap;
     const shape_interactions<TTS, TTI> &intruder_interactions = interactions_for_child (interactions, ci, intruder_interactions_heap);
diff --git a/src/db/unit_tests/dbCompoundOperationTests.cc b/src/db/unit_tests/dbCompoundOperationTests.cc
index 0bc3ec42a..41363e795 100644
--- a/src/db/unit_tests/dbCompoundOperationTests.cc
+++ b/src/db/unit_tests/dbCompoundOperationTests.cc
@@ -137,9 +137,6 @@ TEST(3_BooleanOperations)
     reader.read (ly);
   }
 
-  db::RegionCheckOptions check_options;
-  check_options.metrics = db::Projection;
-
   unsigned int l1 = ly.get_layer (db::LayerProperties (1, 0));
   db::Region r (db::RecursiveShapeIterator (ly, ly.cell (*ly.begin_top_down ()), l1));
 
@@ -166,3 +163,73 @@ TEST(3_BooleanOperations)
   db::compare_layouts (_this, ly, tl::testsrc () + "/testdata/drc/compound_au3.gds");
 }
 
+TEST(4_SizeOperation)
+{
+  db::Layout ly;
+  {
+    std::string fn (tl::testsrc ());
+    fn += "/testdata/drc/compound_4.gds";
+    tl::InputStream stream (fn);
+    db::Reader reader (stream);
+    reader.read (ly);
+  }
+
+  unsigned int l1 = ly.get_layer (db::LayerProperties (1, 0));
+  db::Region r (db::RecursiveShapeIterator (ly, ly.cell (*ly.begin_top_down ()), l1));
+
+  unsigned int l2 = ly.get_layer (db::LayerProperties (2, 0));
+  db::Region r2 (db::RecursiveShapeIterator (ly, ly.cell (*ly.begin_top_down ()), l2));
+
+  db::CompoundRegionOperationPrimaryNode *primary = new db::CompoundRegionOperationPrimaryNode ();
+  db::CompoundRegionSizeOperationNode geo_size (250, 250, 2, primary);
+
+  db::Region res = r.cop_to_region (geo_size);
+
+  unsigned int l1000 = ly.get_layer (db::LayerProperties (1000, 0));
+  res.insert_into (&ly, *ly.begin_top_down (), l1000);
+
+  db::CompoundRegionOperationSecondaryNode *secondary = new db::CompoundRegionOperationSecondaryNode (&r2);
+  db::CompoundRegionSizeOperationNode geo_size2 (-250, -250, 2, secondary);
+
+  res = r.cop_to_region (geo_size2);
+
+  unsigned int l1001 = ly.get_layer (db::LayerProperties (1001, 0));
+  res.insert_into (&ly, *ly.begin_top_down (), l1001);
+
+  CHECKPOINT();
+  db::compare_layouts (_this, ly, tl::testsrc () + "/testdata/drc/compound_au4.gds");
+}
+
+TEST(5_InteractOperation)
+{
+  db::Layout ly;
+  {
+    std::string fn (tl::testsrc ());
+    fn += "/testdata/drc/compound_5.gds";
+    tl::InputStream stream (fn);
+    db::Reader reader (stream);
+    reader.read (ly);
+  }
+
+  db::RegionCheckOptions check_options;
+  check_options.metrics = db::Projection;
+
+  unsigned int l1 = ly.get_layer (db::LayerProperties (1, 0));
+  db::Region r (db::RecursiveShapeIterator (ly, ly.cell (*ly.begin_top_down ()), l1));
+
+  unsigned int l2 = ly.get_layer (db::LayerProperties (2, 0));
+  db::Region r2 (db::RecursiveShapeIterator (ly, ly.cell (*ly.begin_top_down ()), l2));
+
+  db::CompoundRegionOperationPrimaryNode *primary = new db::CompoundRegionOperationPrimaryNode ();
+  db::CompoundRegionOperationSecondaryNode *secondary = new db::CompoundRegionOperationSecondaryNode (&r2);
+  db::CompoundRegionInteractOperationNode interact (primary, secondary, 0, true, false);
+
+  db::Region res = r.cop_to_region (interact);
+
+  unsigned int l1000 = ly.get_layer (db::LayerProperties (1000, 0));
+  res.insert_into (&ly, *ly.begin_top_down (), l1000);
+
+  CHECKPOINT();
+  db::compare_layouts (_this, ly, tl::testsrc () + "/testdata/drc/compound_au5.gds");
+}
+
diff --git a/testdata/drc/compound_4.gds b/testdata/drc/compound_4.gds
new file mode 100644
index 000000000..001eefe47
Binary files /dev/null and b/testdata/drc/compound_4.gds differ
diff --git a/testdata/drc/compound_5.gds b/testdata/drc/compound_5.gds
new file mode 100644
index 000000000..001eefe47
Binary files /dev/null and b/testdata/drc/compound_5.gds differ
diff --git a/testdata/drc/compound_au4.gds b/testdata/drc/compound_au4.gds
new file mode 100644
index 000000000..2869b0529
Binary files /dev/null and b/testdata/drc/compound_au4.gds differ
diff --git a/testdata/drc/compound_au5.gds b/testdata/drc/compound_au5.gds
new file mode 100644
index 000000000..82ae13d74
Binary files /dev/null and b/testdata/drc/compound_au5.gds differ