An AJAX HTTP error occurred. PHP 5.4

Issue Summary

On PHP 5.4 with http://drupal.org/node/1543858#comment-5907752

An AJAX HTTP error occurred.
HTTP Result Code: 403
Debugging information follows.
Path: /panels/ajax/editor/edit-pane/panel_context%3Anode_view%3Anode_view_panel_context/new-2
StatusText: Forbidden
ResponseText:
Access denied | Drupal 7
@import url("http://localhost/modules/system/system.base.css?m6jaa9");
@import url("http://localhost/modules/system/system.menus.css?m6jaa9");
@import url("http://localhost/modules/system/system.messages.css?m6jaa9");
@import url("http://localhost/modules/system/system.theme.css?m6jaa9");
@import url("http://localhost/misc/ui/jquery.ui.core.css?m6jaa9");
@import url("http://localhost/themes/seven/jquery.ui.theme.css?m6jaa9");
@import url("http://localhost/modules/overlay/overlay-parent.css?m6jaa9");
@import url("http://localhost/modules/comment/comment.css?m6jaa9");
@import url("http://localhost/modules/field/theme/field.css?m6jaa9");
@import url("http://localhost/modules/node/node.css?m6jaa9");
@import url("http://localhost/modules/search/search.css?m6jaa9");
@import url("http://localhost/modules/user/user.css?m6jaa9");
@import url("http://localhost/sites/all/modules/contrib/views/css/views.css?m6jaa9");
@import url("http://localhost/sites/all/modules/contrib/admin_menu/admin_menu.css?m6jaa9");
@import url("http://localhost/sites/all/modules/contrib/admin_menu/admin_menu.uid1.css?m6jaa9");
@import url("http://localhost/sites/all/modules/contrib/ctools/css/ctools.css?m6jaa9");
@import url("http://localhost/sites/all/modules/contrib/panels/css/panels.css?m6jaa9");
@import url("http://localhost/modules/shortcut/shortcut.css?m6jaa9");
@import url("http://localhost/themes/seven/reset.css?m6jaa9");
@import url("http://localhost/themes/seven/style.css?m6jaa9");
Skip to main content
Options for the administrative overlayIf you have problems accessing administrative pages on this site, disable the overlay on your profile page. Dismiss this message.
You are hereHome Access denied
Add to Default shortcuts
You are not authorized to access this page.