diff --git a/packages/CLPBN/clpbn/bp/LiftedUtils.h b/packages/CLPBN/clpbn/bp/LiftedUtils.h
index d4ec22c55..181e98789 100644
--- a/packages/CLPBN/clpbn/bp/LiftedUtils.h
+++ b/packages/CLPBN/clpbn/bp/LiftedUtils.h
@@ -37,7 +37,7 @@ class Symbol
 class LogVar
 {
   public:
-    LogVar (void) : id_(numeric_limits<unsigned>::max()) { }
+    LogVar (void) : id_(Util::maxUnsigned()) { }
 
     LogVar (unsigned id) : id_(id) { }
 
@@ -52,7 +52,7 @@ class LogVar
 
     bool valid (void) const
     { 
-      return id_ != numeric_limits<unsigned>::max();
+      return id_ != Util::maxUnsigned();
     }
 
     friend ostream& operator<< (ostream &os, const LogVar& X);
diff --git a/packages/CLPBN/clpbn/bp/Parfactor.cpp b/packages/CLPBN/clpbn/bp/Parfactor.cpp
index 9e86cc23f..bfa9743ea 100644
--- a/packages/CLPBN/clpbn/bp/Parfactor.cpp
+++ b/packages/CLPBN/clpbn/bp/Parfactor.cpp
@@ -285,6 +285,12 @@ Parfactor::expand (LogVar X, LogVar X_new1, LogVar X_new2)
   args_.insert (args_.begin() + fIdx + 1, args_[fIdx]);
   args_[fIdx].rename (X, X_new1);
   args_[fIdx + 1].rename (X, X_new2);
+  if (H1 == 2) {
+    args_[fIdx].clearCountedLogVar();
+  }
+  if (H2 == 2) {
+    args_[fIdx + 1].clearCountedLogVar();
+  }
   ranges_.insert (ranges_.begin() + fIdx + 1, H2);
   ranges_[fIdx] = H1;
 }
diff --git a/packages/CLPBN/clpbn/bp/ProbFormula.cpp b/packages/CLPBN/clpbn/bp/ProbFormula.cpp
index f27221acf..785163202 100644
--- a/packages/CLPBN/clpbn/bp/ProbFormula.cpp
+++ b/packages/CLPBN/clpbn/bp/ProbFormula.cpp
@@ -76,6 +76,14 @@ ProbFormula::setCountedLogVar (LogVar lv)
 
 
 
+void
+ProbFormula::clearCountedLogVar (void)
+{
+  countedLogVar_ = LogVar();
+}
+
+
+
 void
 ProbFormula::rename (LogVar oldName, LogVar newName)
 {
diff --git a/packages/CLPBN/clpbn/bp/ProbFormula.h b/packages/CLPBN/clpbn/bp/ProbFormula.h
index aa6c70bf9..9982c4865 100644
--- a/packages/CLPBN/clpbn/bp/ProbFormula.h
+++ b/packages/CLPBN/clpbn/bp/ProbFormula.h
@@ -50,6 +50,8 @@ class ProbFormula
     LogVar countedLogVar (void) const;
     
     void setCountedLogVar (LogVar);
+
+    void clearCountedLogVar (void);
  
     void rename (LogVar, LogVar);