When I'm trying to edit my header - i'm getting error message: We are sorry, but the page you are looking for does not exist
I can see that you do not have the newest version of Betheme installed.
Please, update it, and check if the problem persists.
The same after update
Please send us the WordPress dashboard and FTP access privately thru the contact form, which is on the right side at http://themeforest.net/user/muffingroup#contact, and we will check what might be the reason.
Please attach a link to this forum discussion.
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Therefore, please ensure that the data you send are complete and correct.