Maybe ask your host about them. He should know where they are.
Maybe you should try downloading a new vbulletin package in case something is wrong with your subscription.php page.
Also, have you tried disabling your plugins and seeing if that fixes it?
Or, have you tried using a different browser to see if you get the same problem?
Or, have you tried using a test account - promote them to admin and give them permissions to see that page - then see if they have the same problem.
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