diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -409,7 +409,7 @@
     'rsrc/js/application/phortune/phortune-credit-card-form.js' => 'd12d214f',
     'rsrc/js/application/policy/behavior-policy-control.js' => '0eaa33a9',
     'rsrc/js/application/policy/behavior-policy-rule-editor.js' => '9347f172',
-    'rsrc/js/application/projects/WorkboardBoard.js' => '106d870f',
+    'rsrc/js/application/projects/WorkboardBoard.js' => 'c02a5497',
     'rsrc/js/application/projects/WorkboardCard.js' => '0392a5d8',
     'rsrc/js/application/projects/WorkboardCardTemplate.js' => '2a61f8d4',
     'rsrc/js/application/projects/WorkboardColumn.js' => 'c3d24e63',
@@ -737,7 +737,7 @@
     'javelin-view-renderer' => '9aae2b66',
     'javelin-view-visitor' => '308f9fe4',
     'javelin-websocket' => 'fdc13e4e',
-    'javelin-workboard-board' => '106d870f',
+    'javelin-workboard-board' => 'c02a5497',
     'javelin-workboard-card' => '0392a5d8',
     'javelin-workboard-card-template' => '2a61f8d4',
     'javelin-workboard-column' => 'c3d24e63',
@@ -1015,18 +1015,6 @@
       'javelin-workflow',
       'phuix-icon-view',
     ),
-    '106d870f' => array(
-      'javelin-install',
-      'javelin-dom',
-      'javelin-util',
-      'javelin-stratcom',
-      'javelin-workflow',
-      'phabricator-draggable-list',
-      'javelin-workboard-column',
-      'javelin-workboard-header-template',
-      'javelin-workboard-card-template',
-      'javelin-workboard-order-template',
-    ),
     '111bfd2d' => array(
       'javelin-install',
     ),
@@ -1940,6 +1928,18 @@
     'bde53589' => array(
       'phui-inline-comment-view-css',
     ),
+    'c02a5497' => array(
+      'javelin-install',
+      'javelin-dom',
+      'javelin-util',
+      'javelin-stratcom',
+      'javelin-workflow',
+      'phabricator-draggable-list',
+      'javelin-workboard-column',
+      'javelin-workboard-header-template',
+      'javelin-workboard-card-template',
+      'javelin-workboard-order-template',
+    ),
     'c03f2fb4' => array(
       'javelin-install',
     ),
diff --git a/src/applications/project/controller/PhabricatorProjectMoveController.php b/src/applications/project/controller/PhabricatorProjectMoveController.php
--- a/src/applications/project/controller/PhabricatorProjectMoveController.php
+++ b/src/applications/project/controller/PhabricatorProjectMoveController.php
@@ -12,18 +12,8 @@
     $column_phid = $request->getStr('columnPHID');
     $object_phid = $request->getStr('objectPHID');
 
-    $after_phid = $request->getStr('afterPHID');
-    $before_phid = $request->getStr('beforePHID');
-
-    $after_phids = array();
-    if ($after_phid) {
-      $after_phids[] = $after_phid;
-    }
-
-    $before_phids = array();
-    if ($before_phid) {
-      $before_phids[] = $before_phid;
-    }
+    $after_phids = $request->getStrList('afterPHIDs');
+    $before_phids = $request->getStrList('beforePHIDs');
 
     $order = $request->getStr('order');
     if (!strlen($order)) {
@@ -98,13 +88,10 @@
       ->setObjectPHIDs(array($object_phid))
       ->executeLayout();
 
-    $order_params = array();
-    if ($after_phid) {
-      $order_params['afterPHIDs'] = $after_phids;
-    }
-    if ($before_phid) {
-      $order_params['beforePHIDs'] = $before_phids;
-    }
+    $order_params = array(
+      'afterPHIDs' => $after_phids,
+      'beforePHIDs' => $before_phids,
+    );
 
     $xactions = array();
     $xactions[] = id(new ManiphestTransaction())
diff --git a/webroot/rsrc/js/application/projects/WorkboardBoard.js b/webroot/rsrc/js/application/projects/WorkboardBoard.js
--- a/webroot/rsrc/js/application/projects/WorkboardBoard.js
+++ b/webroot/rsrc/js/application/projects/WorkboardBoard.js
@@ -409,8 +409,8 @@
 
     _getDropContext: function(after_node, item) {
       var header_key;
-      var before_phid;
-      var after_phid;
+      var after_phids = [];
+      var before_phids = [];
 
       // We're going to send an "afterPHID" and a "beforePHID" if the card
       // was dropped immediately adjacent to another card. If a card was
@@ -424,19 +424,16 @@
       var after_card = after_node;
       while (after_card) {
         after_data = JX.Stratcom.getData(after_card);
-        if (after_data.objectPHID) {
-          break;
-        }
+
         if (after_data.headerKey) {
           break;
         }
-        after_card = after_card.previousSibling;
-      }
 
-      if (after_data) {
         if (after_data.objectPHID) {
-          after_phid = after_data.objectPHID;
+          after_phids.push(after_data.objectPHID);
         }
+
+        after_card = after_card.previousSibling;
       }
 
       if (item) {
@@ -444,19 +441,16 @@
         var before_card = item.nextSibling;
         while (before_card) {
           before_data = JX.Stratcom.getData(before_card);
-          if (before_data.objectPHID) {
-            break;
-          }
+
           if (before_data.headerKey) {
             break;
           }
-          before_card = before_card.nextSibling;
-        }
 
-        if (before_data) {
           if (before_data.objectPHID) {
-            before_phid = before_data.objectPHID;
+            before_phids.push(before_data.objectPHID);
           }
+
+          before_card = before_card.nextSibling;
         }
       }
 
@@ -476,8 +470,8 @@
 
       return {
         headerKey: header_key,
-        afterPHID: after_phid,
-        beforePHID: before_phid
+        afterPHIDs: after_phids,
+        beforePHIDs: before_phids
       };
     },
 
@@ -496,14 +490,8 @@
       };
 
       var context = this._getDropContext(after_node, item);
-
-      if (context.afterPHID) {
-        data.afterPHID = context.afterPHID;
-      }
-
-      if (context.beforePHID) {
-        data.beforePHID = context.beforePHID;
-      }
+      data.afterPHIDs = context.afterPHIDs.join(',');
+      data.beforePHIDs = context.beforePHIDs.join(',');
 
       if (context.headerKey) {
         var properties = this.getHeaderTemplate(context.headerKey)
@@ -530,13 +518,18 @@
         src_phid,
         dst_phid);
 
+      var after_phid = null;
+      if (data.afterPHIDs.length) {
+        after_phid = data.afterPHIDs[0];
+      }
+
       var onupdate = JX.bind(
         this,
         this._oncardupdate,
         list,
         src_phid,
         dst_phid,
-        data.afterPHID);
+        after_phid);
 
       new JX.Workflow(this.getController().getMoveURI(), data)
         .setHandler(onupdate)