diff -up OS-2.10.2/OS/src/OSCommonInterfaces/OSMatrix.cpp.orig OS-2.10.2/OS/src/OSCommonInterfaces/OSMatrix.cpp
--- OS-2.10.2/OS/src/OSCommonInterfaces/OSMatrix.cpp.orig	2017-12-08 06:52:50.000000000 -0700
+++ OS-2.10.2/OS/src/OSCommonInterfaces/OSMatrix.cpp	2019-04-10 16:12:13.198645429 -0600
@@ -168,7 +168,6 @@ MatrixType::MatrixType():
     numberOfColumns(0),
     ExpandedMatrixInRowMajorForm(NULL),
     ExpandedMatrixInColumnMajorForm(NULL),
-    ExpandedMatrixByBlocks(NULL),
     m_miRowPartition(NULL),
     m_iRowPartitionSize(0),
     m_miColumnPartition(NULL),
@@ -3742,11 +3741,9 @@ bool OSMatrix::IsEqual(OSMatrix *that)
         }
         else
         {
-            if (this->idx  != this->idx)  return false; 
-            if (this->name != this->name) return false; 
-            if (!this->MatrixNode::IsEqual(that)) return false;
-
-            return true;
+            if (this->idx  != that->idx)  return false; 
+            if (this->name != that->name) return false; 
+            return this->MatrixNode::IsEqual(that);
         }
     }
 }// end of OSMatrix::IsEqual()