When user 1st time opens “Facebook Feed->Settings” (admin.php?page=cff-top) page plugin automatically redirects him to the “What’s New” (admin.php?page=cff-welcome-new) page, which you blocked. This was a reason of redirection.
I turned Off the related checkbox at “Admin menu”.
Also plugin may force such redirection after its update. So I recommend to leave it unblocked.
