[Boofo]

Also when previewing your signature in your User CP you will see the [YOU] code in the signature, however it WILL work correctly in posts with the signature attached.

This can be fixed by adding another plugin in the profile_editsignature_start hook with the following:

$previewmessage = str_ireplace("[you]", $vbulletin->userinfo[username], $previewmessage);