diff --git a/src/main/java/com/metaweb/gridworks/commands/edit/CreateProjectCommand.java b/src/main/java/com/metaweb/gridworks/commands/edit/CreateProjectCommand.java
index bb27f08a7..51ea49db3 100644
--- a/src/main/java/com/metaweb/gridworks/commands/edit/CreateProjectCommand.java
+++ b/src/main/java/com/metaweb/gridworks/commands/edit/CreateProjectCommand.java
@@ -43,6 +43,7 @@ public class CreateProjectCommand extends Command {
 			ProjectManager.singleton.registerProject(project, pm);
 
 			project.columnModel.update();
+            project.recomputeRowContextDependencies();
 			
 			redirect(response, "/project.html?project=" + project.id);
 		} catch (Exception e) {
diff --git a/src/main/java/com/metaweb/gridworks/model/changes/ColumnAdditionChange.java b/src/main/java/com/metaweb/gridworks/model/changes/ColumnAdditionChange.java
index d5fa6c2b6..89c403355 100644
--- a/src/main/java/com/metaweb/gridworks/model/changes/ColumnAdditionChange.java
+++ b/src/main/java/com/metaweb/gridworks/model/changes/ColumnAdditionChange.java
@@ -36,6 +36,8 @@ public class ColumnAdditionChange extends ColumnChange {
             } catch (Exception e) {
             	e.printStackTrace();
             }
+            project.columnModel.update();
+            project.recomputeRowContextDependencies();
         }
     }
 
@@ -48,6 +50,9 @@ public class ColumnAdditionChange extends ColumnChange {
             }
             
             project.columnModel.columns.remove(_columnIndex);
+            
+            project.columnModel.update();
+            project.recomputeRowContextDependencies();
         }
     }
 
diff --git a/src/main/java/com/metaweb/gridworks/model/changes/ColumnRemovalChange.java b/src/main/java/com/metaweb/gridworks/model/changes/ColumnRemovalChange.java
index 3381a8d24..4313cee79 100644
--- a/src/main/java/com/metaweb/gridworks/model/changes/ColumnRemovalChange.java
+++ b/src/main/java/com/metaweb/gridworks/model/changes/ColumnRemovalChange.java
@@ -34,6 +34,9 @@ public class ColumnRemovalChange extends ColumnChange {
                 
                 row.setCell(cellIndex, null);
             }
+            
+            project.columnModel.update();
+            project.recomputeRowContextDependencies();
         }
     }
 
@@ -46,6 +49,9 @@ public class ColumnRemovalChange extends ColumnChange {
             for (CellAtRow cell : _oldCells) {
                 project.rows.get(cell.row).cells.set(cellIndex, cell.cell);
             }
+            
+            project.columnModel.update();
+            project.recomputeRowContextDependencies();
         }
     }
 
diff --git a/src/main/java/com/metaweb/gridworks/model/changes/MassCellChange.java b/src/main/java/com/metaweb/gridworks/model/changes/MassCellChange.java
index 75b1ecddf..0e9e045d0 100644
--- a/src/main/java/com/metaweb/gridworks/model/changes/MassCellChange.java
+++ b/src/main/java/com/metaweb/gridworks/model/changes/MassCellChange.java
@@ -9,13 +9,16 @@ import com.metaweb.gridworks.model.Row;
 public class MassCellChange implements Change {
 	private static final long serialVersionUID = -933571199802688027L;
 	
-	protected CellChange[] 	_cellChanges;
-	protected int			_commonCellIndex;
+	final protected CellChange[]  _cellChanges;
+	final protected int			  _commonCellIndex;
+	final protected boolean       _updateRowContextDependencies;
 	
-	public MassCellChange(List<CellChange> cellChanges, int commonCellIndex) {
+	public MassCellChange(List<CellChange> cellChanges, int commonCellIndex, boolean updateRowContextDependencies) {
 		_cellChanges = new CellChange[cellChanges.size()];
 		_commonCellIndex = commonCellIndex;
 		cellChanges.toArray(_cellChanges);
+		
+		_updateRowContextDependencies = updateRowContextDependencies;
 	}
 	
 	@Override
@@ -30,6 +33,10 @@ public class MassCellChange implements Change {
 			if (_commonCellIndex >= 0) {
 				project.columnModel.getColumnByCellIndex(_commonCellIndex).clearPrecomputes();
 			}
+			
+			if (_updateRowContextDependencies) {
+			    project.recomputeRowContextDependencies();
+			}
 		}
 	}
 
@@ -45,6 +52,10 @@ public class MassCellChange implements Change {
 			if (_commonCellIndex >= 0) {
 				project.columnModel.getColumnByCellIndex(_commonCellIndex).clearPrecomputes();
 			}
+			
+			if (_updateRowContextDependencies) {
+			    project.recomputeRowContextDependencies();
+			}
 		}
 	}
 }
diff --git a/src/main/java/com/metaweb/gridworks/model/changes/MassRowChange.java b/src/main/java/com/metaweb/gridworks/model/changes/MassRowChange.java
index a2b5d230d..72198111e 100644
--- a/src/main/java/com/metaweb/gridworks/model/changes/MassRowChange.java
+++ b/src/main/java/com/metaweb/gridworks/model/changes/MassRowChange.java
@@ -23,6 +23,8 @@ public class MassRowChange implements Change {
             _oldRows = new ArrayList<Row>(project.rows);
             project.rows.clear();
             project.rows.addAll(_newRows);
+            
+            project.recomputeRowContextDependencies();
         }
     }
 
@@ -31,6 +33,8 @@ public class MassRowChange implements Change {
         synchronized (project) {
             project.rows.clear();
             project.rows.addAll(_oldRows);
+            
+            project.recomputeRowContextDependencies();
         }
     }
 
diff --git a/src/main/java/com/metaweb/gridworks/model/operations/ApproveNewReconOperation.java b/src/main/java/com/metaweb/gridworks/model/operations/ApproveNewReconOperation.java
index abb14e088..5fbcb8de2 100644
--- a/src/main/java/com/metaweb/gridworks/model/operations/ApproveNewReconOperation.java
+++ b/src/main/java/com/metaweb/gridworks/model/operations/ApproveNewReconOperation.java
@@ -20,7 +20,7 @@ public class ApproveNewReconOperation extends EngineDependentMassCellOperation {
 	private static final long serialVersionUID = -5205694623711144436L;
 
 	public ApproveNewReconOperation(JSONObject engineConfig, int cellIndex) {
-		super(engineConfig, cellIndex);
+		super(engineConfig, cellIndex, false);
 	}
 
 	@Override
diff --git a/src/main/java/com/metaweb/gridworks/model/operations/ApproveReconOperation.java b/src/main/java/com/metaweb/gridworks/model/operations/ApproveReconOperation.java
index 8af1d33eb..609d976ed 100644
--- a/src/main/java/com/metaweb/gridworks/model/operations/ApproveReconOperation.java
+++ b/src/main/java/com/metaweb/gridworks/model/operations/ApproveReconOperation.java
@@ -19,7 +19,7 @@ public class ApproveReconOperation extends EngineDependentMassCellOperation {
 	private static final long serialVersionUID = 5393888241057341155L;
 	
 	public ApproveReconOperation(JSONObject engineConfig, int cellIndex) {
-		super(engineConfig, cellIndex);
+		super(engineConfig, cellIndex, false);
 	}
 
 	@Override
diff --git a/src/main/java/com/metaweb/gridworks/model/operations/DiscardReconOperation.java b/src/main/java/com/metaweb/gridworks/model/operations/DiscardReconOperation.java
index 362dfc570..8c067b3f5 100644
--- a/src/main/java/com/metaweb/gridworks/model/operations/DiscardReconOperation.java
+++ b/src/main/java/com/metaweb/gridworks/model/operations/DiscardReconOperation.java
@@ -18,7 +18,7 @@ public class DiscardReconOperation extends EngineDependentMassCellOperation {
 	private static final long serialVersionUID = 6799029731665369179L;
 
 	public DiscardReconOperation(JSONObject engineConfig, int cellIndex) {
-		super(engineConfig, cellIndex);
+		super(engineConfig, cellIndex, false);
 	}
 
 	@Override
diff --git a/src/main/java/com/metaweb/gridworks/model/operations/EngineDependentMassCellOperation.java b/src/main/java/com/metaweb/gridworks/model/operations/EngineDependentMassCellOperation.java
index a1f7f8ea1..8f486195c 100644
--- a/src/main/java/com/metaweb/gridworks/model/operations/EngineDependentMassCellOperation.java
+++ b/src/main/java/com/metaweb/gridworks/model/operations/EngineDependentMassCellOperation.java
@@ -21,10 +21,13 @@ abstract public class EngineDependentMassCellOperation extends EngineDependentOp
 	private static final long serialVersionUID = -8962461328087299452L;
 	
 	final protected int	_cellIndex;
+	final protected boolean _updateRowContextDependencies;
 	
-	protected EngineDependentMassCellOperation(JSONObject engineConfig, int cellIndex) {
+	protected EngineDependentMassCellOperation(
+	        JSONObject engineConfig, int cellIndex, boolean updateRowContextDependencies) {
 		super(engineConfig);
 		_cellIndex = cellIndex;
+		_updateRowContextDependencies = updateRowContextDependencies;
 	}
 
 	@Override
@@ -43,7 +46,7 @@ abstract public class EngineDependentMassCellOperation extends EngineDependentOp
 		
 		String description = createDescription(column, cellChanges);
 		
-		MassCellChange massCellChange = new MassCellChange(cellChanges, _cellIndex);
+		MassCellChange massCellChange = new MassCellChange(cellChanges, _cellIndex, _updateRowContextDependencies);
 		HistoryEntry historyEntry = new HistoryEntry(
 			project, description, this, massCellChange);
 
diff --git a/src/main/java/com/metaweb/gridworks/model/operations/ReconOperation.java b/src/main/java/com/metaweb/gridworks/model/operations/ReconOperation.java
index d52ebd36b..acff7c2c9 100644
--- a/src/main/java/com/metaweb/gridworks/model/operations/ReconOperation.java
+++ b/src/main/java/com/metaweb/gridworks/model/operations/ReconOperation.java
@@ -160,7 +160,7 @@ public class ReconOperation extends EngineDependentOperation {
 				}
 			}
 			
-			MassCellChange massCellChange = new MassCellChange(cellChanges, _cellIndex);
+			MassCellChange massCellChange = new MassCellChange(cellChanges, _cellIndex, false);
 			HistoryEntry historyEntry = new HistoryEntry(
 				_project, 
 				_description, 
diff --git a/src/main/java/com/metaweb/gridworks/model/operations/TextTransformOperation.java b/src/main/java/com/metaweb/gridworks/model/operations/TextTransformOperation.java
index 21fed9cbf..4ae7fcf1b 100644
--- a/src/main/java/com/metaweb/gridworks/model/operations/TextTransformOperation.java
+++ b/src/main/java/com/metaweb/gridworks/model/operations/TextTransformOperation.java
@@ -23,7 +23,7 @@ public class TextTransformOperation extends EngineDependentMassCellOperation {
 	final protected String _expression;
 	
 	public TextTransformOperation(JSONObject engineConfig, int cellIndex, String expression) {
-		super(engineConfig, cellIndex);
+		super(engineConfig, cellIndex, true);
 		_expression = expression;
 	}