Can't use materials and bugged interface

Hi, I can not use materials on my projects, I can’t reach to material library and material interface looks like bugged. How can I fix this?

Version: Rhino 6


Hello - please open Options > Plug-ins page and make sure that the ‘Render development kit’ & ‘Render development kit UI’ plug-ins are present and enabled…?


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That worked!! Thank you very much. I don’t know how it turned off