diff --git a/.travis.yml b/.travis.yml
index 9d45ae8..ab30ad9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,9 +5,9 @@ sudo: false
 language: php
 
 php:
-  - 5.5
   - 5.6
   - 7.0
+  - 7.1
 
 env:
   - DB=MYSQL CORE_RELEASE=4
@@ -18,7 +18,9 @@ before_script:
   - git clone git://github.com/silverstripe/silverstripe-travis-support.git ~/travis-support
   - php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss
   - cd ~/builds/ss
-  - composer install
+  - composer install --prefer-dist --no-progress --no-suggest
+  - composer require silverstripe/versioned:1.x-dev --prefer-dist --no-progress --no-suggest
+  - composer dump-autoload --optimize
 
 script:
   - vendor/bin/phpunit gridfieldextensions/tests
diff --git a/src/GridFieldAddNewMultiClass.php b/src/GridFieldAddNewMultiClass.php
index b428c46..7aa7f2a 100755
--- a/src/GridFieldAddNewMultiClass.php
+++ b/src/GridFieldAddNewMultiClass.php
@@ -145,7 +145,12 @@ class GridFieldAddNewMultiClass implements GridField_HTMLProvider, GridField_URL
             }
         }
 
-        return $result;
+        $sanitised = array();
+        foreach($result as $class=>$title) {
+            $sanitised[$this->sanitiseClassName($class)] = $title;
+        }
+
+        return $sanitised;
     }
 
     /**
@@ -196,11 +201,12 @@ class GridFieldAddNewMultiClass implements GridField_HTMLProvider, GridField_URL
             throw new HTTPResponse_Exception(400);
         }
 
+        $unsanitisedClass = $this->unsanitiseClassName($class);
         $handler = Injector::inst()->create(
             $this->itemRequestClass,
             $grid,
             $component,
-            new $class(),
+            new $unsanitisedClass(),
             $grid->getForm()->getController(),
             'add-multi-class'
         );
@@ -254,4 +260,20 @@ class GridFieldAddNewMultiClass implements GridField_HTMLProvider, GridField_URL
         $this->itemRequestClass = $class;
         return $this;
     }
+
+    /**
+     * Sanitise a model class' name for inclusion in a link
+     * @return string
+     */
+    protected function sanitiseClassName($class) {
+        return str_replace('\\', '-', $class);
+    }
+
+    /**
+     * Unsanitise a model class' name from a URL param
+     * @return string
+     */
+    protected function unsanitiseClassName($class) {
+        return str_replace('-', '\\', $class);
+    }
 }
diff --git a/src/GridFieldOrderableRows.php b/src/GridFieldOrderableRows.php
index b2ac9e9..2d86084 100755
--- a/src/GridFieldOrderableRows.php
+++ b/src/GridFieldOrderableRows.php
@@ -476,8 +476,8 @@ class GridFieldOrderableRows extends RequestHandler implements
             $current = array();
             foreach ($items->toArray() as $record) {
                 // NOTE: _SortColumn0 is the first ->sort() field
-                //		 used by SS when functions are detected in a SELECT
-                //	     or CASE WHEN.
+                //         used by SS when functions are detected in a SELECT
+                //         or CASE WHEN.
                 if (isset($record->_SortColumn0)) {
                     $current[$record->ID] = $record->_SortColumn0;
                 } else {
@@ -514,7 +514,16 @@ class GridFieldOrderableRows extends RequestHandler implements
         // match to order the objects.
         if (!$isVersioned) {
             $sortTable = $this->getSortTable($list);
-            $additionalSQL = (!$list instanceof ManyManyList) ? ', "LastEdited" = NOW()' : '';
+            $additionalSQL = '';
+            $baseTable = $sortTable;
+            if(class_exists($sortTable)) {
+                $baseTable = singleton($sortTable)->baseTable();
+            }
+            $isBaseTable = ($baseTable == $sortTable);
+            if(!$list instanceof ManyManyList && $isBaseTable){
+                $additionalSQL = ', "LastEdited" = NOW()';
+            }
+
             foreach ($sortedIDs as $sortValue => $id) {
                 if ($map[$id] != $sortValue) {
                     DB::query(sprintf(
@@ -525,6 +534,14 @@ class GridFieldOrderableRows extends RequestHandler implements
                         $additionalSQL,
                         $this->getSortTableClauseForIds($list, $id)
                     ));
+
+                    if(!$isBaseTable) {
+                        DB::query(sprintf(
+                            'UPDATE "%s" SET "LastEdited" = NOW() WHERE %s',
+                            $baseTable,
+                            $this->getSortTableClauseForIds($list, $id)
+                        ));
+                    }
                 }
             }
         } else {
@@ -550,7 +567,16 @@ class GridFieldOrderableRows extends RequestHandler implements
         $field  = $this->getSortField();
         $table  = $this->getSortTable($list);
         $clause = sprintf('"%s"."%s" = 0', $table, $this->getSortField());
-        $additionalSQL = (!$list instanceof ManyManyList) ? ', "LastEdited" = NOW()' : '';
+
+        $additionalSQL = '';
+        $baseTable = $table;
+        if(class_exists($table)) {
+            $baseTable = singleton($table)->baseTable();
+        }
+        $isBaseTable = ($baseTable == $table);
+        if(!$list instanceof ManyManyList && $isBaseTable){
+            $additionalSQL = ', "LastEdited" = NOW()';
+        }
 
         foreach ($list->where($clause)->column('ID') as $id) {
             $max = DB::query(sprintf('SELECT MAX("%s") + 1 FROM "%s"', $field, $table));
@@ -564,6 +590,14 @@ class GridFieldOrderableRows extends RequestHandler implements
                 $additionalSQL,
                 $this->getSortTableClauseForIds($list, $id)
             ));
+
+            if(!$isBaseTable) {
+                DB::query(sprintf(
+                    'UPDATE "%s" SET "LastEdited" = NOW() WHERE %s',
+                    $baseTable,
+                    $this->getSortTableClauseForIds($list, $id)
+                ));
+            }
         }
     }
 
diff --git a/tests/GridFieldAddNewMultiClassWithNamespacesTest.php b/tests/GridFieldAddNewMultiClassWithNamespacesTest.php
new file mode 100644
index 0000000..bb00d5d
--- /dev/null
+++ b/tests/GridFieldAddNewMultiClassWithNamespacesTest.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace Symbiote\Test;
+
+use SilverStripe\Control\Controller;
+use SilverStripe\Control\HTTPRequest;
+use SilverStripe\Dev\SapphireTest;
+use SilverStripe\Dev\TestOnly;
+use SilverStripe\Forms\FieldList;
+use SilverStripe\Forms\Form;
+use SilverStripe\Forms\GridField\GridField;
+use SilverStripe\Forms\GridField\GridFieldDetailForm;
+use Symbiote\GridFieldExtensions\GridFieldAddNewMultiClass;
+use Symbiote\GridFieldExtensions\GridFieldAddNewMultiClassHandler;
+
+class GridFieldAddNewMultiClassWithNamespacesTest extends SapphireTest {
+
+	public function testGetClassesWithNamespaces() {
+		$grid = new GridField('TestGridField');
+		$grid->setModelClass('Symbiote\\Test\\NamespacedClass');
+
+		$component = new GridFieldAddNewMultiClass();
+
+		$this->assertEquals(
+			array(
+				'Symbiote-Test-NamespacedClass' => 'NamespacedClass'
+			),
+			$component->getClasses($grid),
+			'Namespaced classes are sanitised'
+		);
+	}
+
+	public function testHandleAddWithNamespaces() {
+		$grid = new GridField('TestGridField');
+		$grid->getConfig()->addComponent(new GridFieldDetailForm());
+		$grid->setModelClass('Symbiote\\Test\\NamespacedClass');
+		$grid->setForm(Form::create(Controller::create(), 'test', FieldList::create(), FieldList::create()));
+
+		$request = new HTTPRequest('POST', 'test');
+		$request->setRouteParams(array('ClassName' => 'Symbiote-Test-NamespacedClass'));
+
+		$component = new GridFieldAddNewMultiClass();
+		$response = $component->handleAdd($grid, $request);
+
+		$record = new \ReflectionProperty(GridFieldAddNewMultiClassHandler::class, 'record');
+		$record->setAccessible(true);
+		$this->assertInstanceOf('Symbiote\\Test\\NamespacedClass', $record->getValue($response));
+	}
+
+}
+
+/**#@+
+ * @ignore
+ */
+
+class NamespacedClass implements TestOnly {
+	public function i18n_singular_name() {
+		return 'NamespacedClass';
+	}
+
+	public function canCreate() {
+		return true;
+	}
+}
+
+/**#@-*/