Hi, you can't use chdir if the directories you're changing from and to are on different physical servers. To use the hack on different servers would require a complete rewrite so that it didn't use the vbulletin global.php file.
It would work using the full server path, if you had something like
home/htdocs/www.site1.com
home/htdocs/www.site2.com
as the directories are on the same server.
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