What date in 2011 is the backup from?
I am not sure if upgrading will fix your issue, as I truely don't know what was done to your site to cause this issue.
If your site is not very busy & you think you will not lose many threads/post installing the database backup then I would suggest installing it.
I would suggest submitting a ticket on vbulletin.com & explain to support staff exactly what was done to your site to cause this issue & see if they can offer a better solution.
Also, link them to this thread for a quicker understanding of your issue.
In the future, create a copy of your database daily or weekly just in case issues like this come up.
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