Page Editor is crashing on very specific JSON requests.

Forgot to include the JSON output:
[ { "command": "settings", "argument": { "basePath": "/", "thickbox": { "close": "Close", "next": "Next \x3e", "prev": "\x3c Prev", "esc_key": "or Esc Key", "next_close": "Next / Close on last", "image_count": "Image !current of !total" } } }, { "command": "css_files", "argument": [ { "file": "/modules/aggregator/aggregator.css?e", "media": "all" }, { "file": "/modules/book/book.css?e", "media": "all" }, { "file": "/modules/node/node.css?e", "media": "all" }, { "file": "/modules/system/defaults.css?e", "media": "all" }, { "file": "/modules/system/system.css?e", "media": "all" }, { "file": "/modules/system/system-menus.css?e", "media": "all" }, { "file": "/modules/user/user.css?e", "media": "all" }, { "file": "/sites/all/modules/admin_menu/admin_menu.css?e", "media": "all" }, { "file": "/sites/all/modules/cck/theme/content-module.css?e", "media": "all" }, { "file": "/sites/all/modules/ctools/css/ctools.css?e", "media": "all" }, { "file": "/sites/all/modules/date/date.css?e", "media": "all" }, { "file": "/sites/all/modules/date/date_popup/themes/datepicker.css?e", "media": "all" }, { "file": "/sites/all/modules/date/date_popup/themes/timeentry.css?e", "media": "all" }, { "file": "/sites/all/modules/filefield/filefield.css?e", "media": "all" }, { "file": "/sites/all/modules/panels/css/panels.css?e", "media": "all" }, { "file": "/sites/all/modules/thickbox/thickbox.css?e", "media": "all" }, { "file": "/sites/all/modules/thickbox/thickbox_ie.css?e", "media": "all" }, { "file": "/sites/all/modules/ubercart/uc_attribute/uc_attribute.css?e", "media": "all" }, { "file": "/sites/all/modules/ubercart/uc_order/uc_order.css?e", "media": "all" }, { "file": "/sites/all/modules/ubercart/uc_product/uc_product.css?e", "media": "all" }, { "file": "/sites/all/modules/ubercart/uc_store/uc_store.css?e", "media": "all" }, { "file": "/sites/all/modules/cck/modules/fieldgroup/fieldgroup.css?e", "media": "all" }, { "file": "/sites/all/modules/views/css/views.css?e", "media": "all" }, { "file": "/sites/all/modules/hierarchical_select/hierarchical_select.css?e", "media": "all" }, { "file": "/sites/all/modules/ctools/css/dropdown.css?e", "media": "all" } ] }, { "command": "scripts", "argument": [ "/misc/jquery.js?e", "/misc/drupal.js?e", "/sites/all/modules/admin_menu/admin_menu.js?e", "/sites/all/modules/panels/js/panels.js?e", "/sites/all/modules/thickbox/thickbox.js?e", "/sites/all/modules/hierarchical_select/hierarchical_select.js?e", "/sites/all/modules/hierarchical_select/hierarchical_select_formtoarray.js?e", "/sites/all/modules/hierarchical_select/js/jquery.ui/effects.core.js?e", "/sites/all/modules/hierarchical_select/js/jquery.ui/effects.drop.js?e", "/sites/all/modules/hierarchical_select/includes/views.js?e", "/sites/all/modules/views/js/base.js?e", "/sites/all/modules/views/js/dependent.js?e", "/sites/all/modules/ctools/js/dropdown.js?e" ] }, { "command": "append", "selector": "#panel-pane-region1", "data": "\x3cdiv class=\"panel-pane\" id=\"panel-pane-new-1\"\x3e\x3cdiv class=\"grabber\"\x3e\x3cspan class=\"buttons\"\x3e\x3cdiv class=\"ctools-dropdown-no-js ctools-dropdown\" id=\"ctools-dropdown-1\"\x3e\x3cdiv class=\"ctools-dropdown-link-wrapper\"\x3e\x3ca href=\"#\" class=\"ctools-dropdown-link ctools-dropdown-image-link\"\x3e\x3cimg src=\"/sites/all/modules/panels/images/icon-configure.png\" alt=\"\" title=\"\" width=\"16\" height=\"16\" /\x3e\x3c/a\x3e\x3c/div\x3e\x3cdiv class=\"ctools-dropdown-container-wrapper\"\x3e\x3cdiv class=\"ctools-dropdown-container\"\x3e\x3cul class=\"links\"\x3e\x3cli class=\"0 first\"\x3e\x3ca href=\"/panels/ajax/editor/hide/panel_context%3Apage-frontpage%3Apage_frontpage_panel_context/new-1\" class=\"ctools-use-ajax\"\x3eDisable this pane\x3c/a\x3e\x3c/li\x3e\n\x3cli class=\"panels-set-title\"\x3e\x3ca href=\"/panels/ajax/editor/panel-title/panel_context%3Apage-frontpage%3Apage_frontpage_panel_context/new-1\" class=\"ctools-use-ajax\"\x3ePanel title\x3c/a\x3e\x3c/li\x3e\n\x3cli class=\"1\"\x3e\x3ca href=\"/panels/ajax/editor/edit-pane/panel_context%3Apage-frontpage%3Apage_frontpage_panel_context/new-1\" class=\"ctools-use-modal\"\x3eSettings\x3c/a\x3e\x3c/li\x3e\n\x3cli class=\"2\"\x3e\x3ca href=\"/panels/ajax/editor/pane-css/panel_context%3Apage-frontpage%3Apage_frontpage_panel_context/new-1\" class=\"ctools-use-modal\"\x3eCSS properties\x3c/a\x3e\x3c/li\x3e\n\x3cli class=\"3\"\x3e\x3cspan\x3e\x3chr /\x3e\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"4\"\x3e\x3cspan class=\"panels-sub-menu\"\x3e\x3cspan class=\"dropdown-header\"\x3eStyle\x3c/span\x3e\x3cul class=\"links\"\x3e\x3cli class=\"0 first\"\x3e\x3cspan class=\"panels-text\"\x3eNo style\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"1 last\"\x3e\x3ca href=\"/panels/ajax/editor/style-type/panel_context%3Apage-frontpage%3Apage_frontpage_panel_context/pane/new-1\" class=\"ctools-use-modal\"\x3eChange\x3c/a\x3e\x3c/li\x3e\n\x3c/ul\x3e\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"5\"\x3e\x3cspan\x3e\x3chr /\x3e\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"6\"\x3e\x3cspan class=\"panels-sub-menu\"\x3e\x3cspan class=\"dropdown-header\"\x3eVisibility rules\x3c/span\x3e\x3cul class=\"links\"\x3e\x3cli class=\"0 first\"\x3e\x3cspan class=\"panels-text\"\x3eNo rules\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"1\"\x3e\x3ca href=\"/panels/ajax/editor/access-add-test/panel_context%3Apage-frontpage%3Apage_frontpage_panel_context/new-1\" class=\"ctools-use-modal\"\x3eAdd new rule\x3c/a\x3e\x3c/li\x3e\n\x3cli class=\"2 last\"\x3e\x3ca href=\"/panels/ajax/editor/access-settings/panel_context%3Apage-frontpage%3Apage_frontpage_panel_context/new-1\" class=\"ctools-use-modal\"\x3eSettings\x3c/a\x3e\x3c/li\x3e\n\x3c/ul\x3e\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"7\"\x3e\x3cspan\x3e\x3chr /\x3e\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"8\"\x3e\x3cspan class=\"panels-sub-menu\"\x3e\x3cspan class=\"dropdown-header\"\x3eCaching\x3c/span\x3e\x3cul class=\"links\"\x3e\x3cli class=\"0 first\"\x3e\x3cspan class=\"panels-text\"\x3eNo caching\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"1 last\"\x3e\x3ca href=\"/panels/ajax/editor/cache-method/panel_context%3Apage-frontpage%3Apage_frontpage_panel_context/new-1\" class=\"ctools-use-modal\"\x3eChange\x3c/a\x3e\x3c/li\x3e\n\x3c/ul\x3e\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"9\"\x3e\x3cspan\x3e\x3chr /\x3e\x3c/span\x3e\x3c/li\x3e\n\x3cli class=\"10 last\"\x3e\x3ca href=\"/%2523\" class=\"pane-delete\" id=\"pane-delete-panel-pane-new-1\"\x3eRemove\x3c/a\x3e\x3c/li\x3e\n\x3c/ul\x3e\x3c/div\x3e\x3c/div\x3e\x3c/div\x3e\x3c/span\x3e\x3cspan class=\"text\"\x3eNewest Product\x3c/span\x3e\x3c/div\x3e\x3cdiv class=\"panel-pane-collapsible\"\x3e\x3cdiv class=\"pane-title\"\x3eGrabs only the latest single product info.\x3c/div\x3e\x3cdiv class=\"pane-content\"\x3e\x3c/div\x3e\x3c/div\x3e\x3c/div\x3e" }, { "command": "changed", "selector": "#panel-pane-new-1", "star": "div.grabber span.text" }, { "command": "modal_dismiss" } ]

Found out Hierarchical select was affecting things. Have since moved up to D7 without HS. Cleaning up my queue.