Links in new menu don’t work

You have a script active that prevents normal behaviour of links if they have no target="_blank" attribute on them. The original site has this attribute on the link to the blog, so that one works. The ‘new’ site doesn’t have it on the menu links, so those links are disabled.

To fix this, go to the menu section in admin. In your screen option, make sure that you can edit the target on links. Change accordingly.

Note that this means every page of your site will be opened in a new window, which is not very user friendly. Changing the script would be better.