Navigation menu not editable after installation of new theme

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Hello,
We have installed an externally purchased theme (Passport, themeforest), and now, our menu navigation header no longer shows up. Moreover, it is not possible for us to edit the sample menu header in the passport theme (there is no edit function for this part). Our menu tree is still in the dashboard, it just doesn't appear on the site. If we switch back to one of the sample themes, the menu sometimes shows up and sometimes doesn't, but it looks pretty strange now. Can anyone help? Our host is Dreamhost.
Thanks in advance.

 
hutman replied on at Permalink Reply
hutman
This is a question to ask the theme builder on Themeforest. All of the themes sold in the Concrete5 Marketplace are tested and approved by the PRB but there is no such testing done on themes from other sites.
carlzata replied on at Permalink Reply
carlzata
You should check your new themes template file (default.php)
The name of the your area for the navigation menu might be different from you old theme and/or the area is missing.