Missing menus

I’ve just upgraded to the new version of Highend, and now the menus no longer expand on all pages – except for the Blog page, where the menus expand fine. So along the top, all I see is Home, Pages, Blog and cannot drill down. But if I click Blog, then on that page all the menus can be expanded (on Home, Pages AND Blog).

Hopefully the attached image will explain more clearly.

Any help appreciated.

Thanks