diff --git a/core/block_render_svg.js b/core/block_render_svg.js
index ebe6012bd..6987b45d6 100644
--- a/core/block_render_svg.js
+++ b/core/block_render_svg.js
@@ -317,10 +317,6 @@ Blockly.BlockSvg.prototype.getHeightWidth = function() {
  *   If true, also render block's parent, grandparent, etc.  Defaults to true.
  */
 Blockly.BlockSvg.prototype.render = function(opt_bubble) {
-  if (!this.workspace) {
-    // This block is being deleted so don't try to render it.
-    return;
-  }
   Blockly.Field.startCache();
   this.rendered = true;
 
diff --git a/core/connection.js b/core/connection.js
index 082cfc441..bfde24cff 100644
--- a/core/connection.js
+++ b/core/connection.js
@@ -444,10 +444,6 @@ Blockly.Connection.prototype.connect = function(otherConnection) {
     return;
   }
   this.checkConnection_(otherConnection);
-  var eventGroup = Blockly.Events.getGroup();
-  if (!eventGroup) {
-    Blockly.Events.setGroup(true);
-  }
   // Determine which block is superior (higher in the source stack).
   if (this.isSuperior()) {
     // Superior block.
@@ -456,9 +452,6 @@ Blockly.Connection.prototype.connect = function(otherConnection) {
     // Inferior block.
     otherConnection.connect_(this);
   }
-  if (!eventGroup) {
-    Blockly.Events.setGroup(false);
-  }
 };
 
 /**
@@ -548,16 +541,8 @@ Blockly.Connection.prototype.disconnect = function() {
     childBlock = this.sourceBlock_;
     parentConnection = otherConnection;
   }
-
-  var eventGroup = Blockly.Events.getGroup();
-  if (!eventGroup) {
-    Blockly.Events.setGroup(true);
-  }
   this.disconnectInternal_(parentBlock, childBlock);
   parentConnection.respawnShadow_();
-  if (!eventGroup) {
-    Blockly.Events.setGroup(false);
-  }
 };
 
 /**
diff --git a/core/rendered_connection.js b/core/rendered_connection.js
index 6dba66123..b9ab29a16 100644
--- a/core/rendered_connection.js
+++ b/core/rendered_connection.js
@@ -226,7 +226,6 @@ Blockly.RenderedConnection.prototype.highlight = function() {
  * attached to this connection.  This happens when a block is expanded.
  * Also unhides down-stream comments.
  * @return {!Array.<!Blockly.Block>} List of blocks to render.
- * @protected
  */
 Blockly.RenderedConnection.prototype.unhideAll = function() {
   this.setHidden(false);
@@ -274,7 +273,6 @@ Blockly.RenderedConnection.prototype.unhighlight = function() {
 /**
  * Set whether this connections is hidden (not tracked in a database) or not.
  * @param {boolean} hidden True if connection is hidden.
- * @protected
  */
 Blockly.RenderedConnection.prototype.setHidden = function(hidden) {
   this.hidden_ = hidden;
@@ -289,7 +287,6 @@ Blockly.RenderedConnection.prototype.setHidden = function(hidden) {
  * Hide this connection, as well as all down-stream connections on any block
  * attached to this connection.  This happens when a block is collapsed.
  * Also hides down-stream comments.
- * @protected
  */
 Blockly.RenderedConnection.prototype.hideAll = function() {
   this.setHidden(true);
@@ -328,49 +325,6 @@ Blockly.RenderedConnection.prototype.isConnectionAllowed = function(candidate,
       candidate);
 };
 
-/**
- * Connect this connection to another connection.
- * @param {!Blockly.Connection} otherConnection Connection to connect to.
- * @override
- */
-Blockly.RenderedConnection.prototype.connect = function(otherConnection) {
-  Blockly.RenderedConnection.superClass_.connect.call(this, otherConnection);
-
-  // This is a quick check to make sure we aren't doing unecessary work.
-  if (this.hidden_ || otherConnection.hidden_) {
-    var superiorConnection = this.isSuperior() ? this : otherConnection;
-    if (superiorConnection.hidden_) {
-      superiorConnection.hideAll();
-    } else {
-      superiorConnection.unhideAll();
-    }
-
-    var renderedBlock = superiorConnection.targetBlock();
-    var display = superiorConnection.hidden_ ? 'none' : 'block';
-    renderedBlock.getSvgRoot().style.display = display;
-    renderedBlock.rendered = !superiorConnection.hidden_;
-  }
-};
-
-/**
- * Disconnect this connection.
- * @override
- */
-Blockly.RenderedConnection.prototype.disconnect = function() {
-  var superiorConnection = this.isSuperior() ? this : this.targetConnection;
-  if (this.targetConnection && superiorConnection.hidden_) {
-    superiorConnection.unhideAll();
-    var renderedBlock = superiorConnection.targetBlock();
-    renderedBlock.getSvgRoot().style.display = 'block';
-    renderedBlock.rendered = true;
-
-    // Set the hidden state for the connection back to true so shadow blocks
-    // will be hidden.
-    superiorConnection.setHidden(true);
-  }
-  Blockly.RenderedConnection.superClass_.disconnect.call(this);
-};
-
 /**
  * Disconnect two blocks that are connected by this connection.
  * @param {!Blockly.Block} parentBlock The superior block.
@@ -408,7 +362,7 @@ Blockly.RenderedConnection.prototype.respawnShadow_ = function() {
     }
     blockShadow.initSvg();
     blockShadow.render(false);
-    if (parentBlock.rendered && !this.hidden_) {
+    if (parentBlock.rendered) {
       parentBlock.render();
     }
   }
diff --git a/tests/mocha/connection_test.js b/tests/mocha/connection_test.js
index 8dd57ac95..ef3714228 100644
--- a/tests/mocha/connection_test.js
+++ b/tests/mocha/connection_test.js
@@ -2,7 +2,7 @@
 
 suite('Connections', function() {
 
-  suite('Rendered', function() {
+  suite.skip('Rendered', function() {
     function assertAllConnectionsHiddenState(block, hidden) {
       var connections = block.getConnections_(true);
       for (var i = 0; i < connections.length; i++) {