"You are not authorized to access this page." when clicking on "Manage display"

+++ b/ds.moduleundefined
@@ -1325,9 +1325,9 @@ function ds_contextual_links_view_alter(&$element, $items) {
+    if (empty($layout) && !$overridden || $layout && $overridden === NULL) {

this looks freaky because you now have this:

AND OR AND

without any parentheses, I assume we want to group this no ?

I don't think your fix is correct:

-    $overriden = (!empty($view_mode_settings[$view_mode]['custom_settings']) ? TRUE : FALSE);
+    $overridden = (!empty($view_mode_settings[$view_mode]['custom_settings']) ? TRUE : FALSE);
 
-    if (empty($layout) && !$overriden) {
+    if ((empty($layout) && !$overridden) || ($layout && $overridden === NULL)) {
       $admin_path .= '/display';
     }

First you set the variable to TRUE or FALSE and afterwards you check if it equals NULL....
I have the same problem but it is only related to the default view mode afaict.
When accessing the default view_mode the machine name is not appended to the manage display path.

Hmmm this could work. I let this to Swentel to verify if it's ok.
If we don't need the $layout checkout we should remove

// Check if we have a configured layout. Do not fallback to default.
$layout = ds_get_layout($entity_type, $bundle, $view_mode, FALSE);

So yeah, that problably makes sense indeed, will test this some more, going to write for a test for it as well to make sure this stays ok in the future.

Ironically enough I hit this bug during my demo in Portland, but could not reproduce anymore locally. Anyway committed because the fix looks sane, I've changed the typo's as well in both branches.