From Ray's announcement -
vBulletin Beta 3 Released to Customers with 4.0 Licenses:
Quote:
Is there anything we should be especially careful of?
New, fresh installations have been relatively predictable, but we have experienced some potentially serious issues upgrading existing vBulletin installations, depending on customization, configuration and certain aspects your database. In particular, disable all of your plugins before attempting upgrades.
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You did NOT disable your plugins.