:Unfortunately (as I figured out after I blocked him, and looked at the history of the page he was vandalizing) he's hopping IPs with each edit.  They're probably open proxies  85. is in Europe, 68. in the U.S., for example  so blocking each one as a preventive measure won't work. Only page protection, which another admin, really works in this case.  AIV would help if no one else is noticing; we get this type of trolling pretty often, and the more people who help out the better.  Thanks,