--- OriModules/cck_fieldgroup_tabs/cck_fieldgroup_tabs.module	2009-01-16 09:45:56.000000000 +0300
+++ sites/all/modules/cck_fieldgroup_tabs/cck_fieldgroup_tabs.module	2009-08-24 17:11:27.000000000 +0300
@@ -177,6 +177,16 @@ function cck_fieldgroup_tabs_nodeapi(&$n
           $element['#title'] = t(check_plain($group['label']));
           $node->content['fieldgroup_tabs'][$group_name] = $element;
           unset($node->content[$group_name]);
+          $previousgroup = $group_name;
+        } else {
+           if (isset($node->content['fieldgroup_tabs'])) {
+            $element = $node->content[$group_name];
+            $element['#weight'] = $group['weight'];
+            // Title is required for tabs.
+            $element['#title'] = t(check_plain($group['label']));
+            $node->content['fieldgroup_tabs'][$previousgroup][$group_name] = $element;
+            unset($node->content[$group_name]);
+          }
         }
       }
       if (isset($node->content['fieldgroup_tabs'])) {