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I see error “You do not have sufficient permissions to access this page” on some of WordPress dashboard pages

You may have this issue by different reasons but this does not related to theme:

1) You see this in Visual Composer plugin settings page - this is confirmed VC plugin bug, you should not see this plugin page link if plugin bundled with theme and does not need to use this page because theme managed this settings.

2) You are not administrator and does not have rights to access this page (check access rights in Users for your current user).