Layout issue at Admin categories page

[a4antonis]

Hi.

I have an issue with the admin page Manage Categories. The page loads fine for half a second and then ends up looking like this:

Plus, the category tree will not show the subcategories if expanded.

I dont visit the categories page too often and thus I am not sure when this error appeared.

I am working on Magento 1.9.2.2. Any idea on the file(s) that cause this error?

I dont know if that helps but the last lines in the profiler are

mage::dispatch::controller::action::adminhtml_catalog_category_edit::layout_render
adminhtml/default/default/template/page.phtml
adminhtml/default/default/template/page/head.phtml
adminhtml/default/default/template/page/js/calendar.phtml
adminhtml/default/default/template/page/header.phtml
adminhtml/default/default/template/page/menu.phtml
CORE::create_object_of::Mage_Admin_Model_Config
adminhtml/default/default/template/notification/baseurl.phtml
adminhtml/default/default/template/notification/survey.phtml
adminhtml/default/default/template/index/notifications.phtml
adminhtml/default/default/template/tax/notifications.phtml
adminhtml/default/default/template/amasty/ambase/promo.phtml
adminhtml/default/default/template/catalog/category/tree.phtml
CORE::create_object_of::Mage_Catalog_Model_Resource_Category_Tree
CORE::create_object_of::Mage_Catalog_Model_Resource_Category_Collection
DISPATCH EVENT:adminhtml_catalog_category_tree_is_moveable
adminhtml/default/default/template/amasty/ambase/update.phtml
adminhtml/default/default/template/catalog/category/edit.phtml
adminhtml/default/default/template/catalog/category/edit/form.phtml
adminhtml/default/default/template/widget/tabshoriz.phtml
adminhtml/default/default/template/page/footer.phtml

[MageWorxTeam]

Probably, the problem may be connected with javascript on the page. Try to disable modules that were added recently one by one and check the effect.

On top of that, a screenshot of your console (browser) during the page loading may be helpful to solve this.