Cannot find materials panel

Hi there, quite new here and english is not my native language, but I’ll give it a try:
I cannot find the materialspanel, it doesnt seem to work. Nor does the button “Toggle materials panel” work. It seems to be missing.

materials panel

right click on layers at the bottom to open the panels, then drag to dock, then right click on an existing tab to open the list, then check materials to add it to the panel-

Also make sure the Render Development Kit, Render Development Kit UI and RDK_EtoUI plugins are loaded