diff --git a/diylc/diylc-core/src/org/diylc/core/Project.java b/diylc/diylc-core/src/org/diylc/core/Project.java
index dabc54a2..0fa86a53 100644
--- a/diylc/diylc-core/src/org/diylc/core/Project.java
+++ b/diylc/diylc-core/src/org/diylc/core/Project.java
@@ -255,6 +255,31 @@ public class Project implements Serializable {
       if (other.width != null)
         return false;
     } else if (!width.equals(other.width))
+      return false;
+    if (gridSpacing == null) {
+      if (other.gridSpacing != null)
+        return false;
+    } else if (!gridSpacing.equals(other.gridSpacing))
+      return false;
+    if (font == null) {
+      if (other.font != null)
+        return false;
+    } else if (!font.equals(other.font))
+      return false;
+    if (groups == null) {
+      if (other.groups != null)
+        return false;
+    } else if (!groups.equals(other.groups))
+      return false;
+    if (lockedLayers == null) {
+      if (other.lockedLayers != null)
+        return false;
+    } else if (!lockedLayers.equals(other.lockedLayers))
+      return false;
+    if (hiddenLayers == null) {
+      if (other.hiddenLayers != null)
+        return false;
+    } else if (!hiddenLayers.equals(other.hiddenLayers))
       return false;
     return true;
   }
diff --git a/diylc/diylc-core/src/org/diylc/presenter/Presenter.java b/diylc/diylc-core/src/org/diylc/presenter/Presenter.java
index 20f2d9d4..cf6fabd6 100644
--- a/diylc/diylc-core/src/org/diylc/presenter/Presenter.java
+++ b/diylc/diylc-core/src/org/diylc/presenter/Presenter.java
@@ -1592,6 +1592,7 @@ public class Presenter implements IPlugInPort {
   @Override
   public void setLayerLocked(int layerZOrder, boolean locked) {
     LOG.info(String.format("setLayerLocked(%s, %s)", layerZOrder, locked));
+    Project oldProject = currentProject.clone();
     if (locked) {
       currentProject.getLockedLayers().add(layerZOrder);
     } else {
@@ -1600,11 +1601,16 @@ public class Presenter implements IPlugInPort {
     updateSelection(EMPTY_SELECTION);
     messageDispatcher.dispatchMessage(EventType.REPAINT);
     messageDispatcher.dispatchMessage(EventType.LAYER_STATE_CHANGED, currentProject.getLockedLayers());
+    if (!oldProject.equals(currentProject)) {
+      messageDispatcher.dispatchMessage(EventType.PROJECT_MODIFIED, oldProject, currentProject.clone(), locked ? "Lock Layer" : "Unlock Layer");
+      projectFileManager.notifyFileChange();
+    }
   }
 
   @Override
   public void setLayerVisibility(int layerZOrder, boolean visible) {
     LOG.info(String.format("setLayerVisibility(%s, %s)", layerZOrder, visible));
+    Project oldProject = currentProject.clone();
     if (visible) {
       currentProject.getHiddenLayers().remove(layerZOrder);
     } else {
@@ -1613,6 +1619,10 @@ public class Presenter implements IPlugInPort {
     updateSelection(EMPTY_SELECTION);
     messageDispatcher.dispatchMessage(EventType.REPAINT);
     messageDispatcher.dispatchMessage(EventType.LAYER_VISIBILITY_CHANGED, currentProject.getHiddenLayers());
+    if (!oldProject.equals(currentProject)) {
+      messageDispatcher.dispatchMessage(EventType.PROJECT_MODIFIED, oldProject, currentProject.clone(), visible ? "Show Layer" : "Hide Layer");
+      projectFileManager.notifyFileChange();
+    }
   }
 
   @SuppressWarnings("unchecked")
diff --git a/diylc/diylc-swing/update.xml b/diylc/diylc-swing/update.xml
index 3f7f2df9..e6c5a6a6 100644
--- a/diylc/diylc-swing/update.xml
+++ b/diylc/diylc-swing/update.xml
@@ -2140,7 +2140,7 @@
 			<changes>
 				<org.diylc.appframework.update.Change>
 					<changeType>NEW_FEATURE</changeType>
-					<description>Added "Label Orientation" property to leaded components that can be used to force labels to be rendered horizontally instead of following component placement direction</description>
+					<description>Added "Label Orientation" property to leaded components that can be used to force component labels to be rendered horizontally instead of following component placement direction</description>
 				</org.diylc.appframework.update.Change>
 				<org.diylc.appframework.update.Change>
 					<changeType>NEW_FEATURE</changeType>
@@ -2169,10 +2169,14 @@
 				<org.diylc.appframework.update.Change>
 					<changeType>BUG_FIX</changeType>
 					<description>Project font gets reverted to "Square721 BT" on Undo</description>
-				</org.diylc.appframework.update.Change>	
+				</org.diylc.appframework.update.Change>
 				<org.diylc.appframework.update.Change>
 					<changeType>BUG_FIX</changeType>
-					<description>When loaded from an existing file "Potentiometer Symbol" doesn't retain the specified orientation</description>
+					<description>Some actions do not register with Undo/Redo mechanism: project font, layer settings, group/ungroup</description>
+				</org.diylc.appframework.update.Change>		
+				<org.diylc.appframework.update.Change>
+					<changeType>BUG_FIX</changeType>
+					<description>When loaded from an existing file, "Potentiometer Symbol" doesn't retain the specified orientation</description>
 				</org.diylc.appframework.update.Change>	
 			</changes>
 			<url>https://github.com/bancika/diy-layout-creator/releases</url>