Kayden - Do you have any special mod installed which overrides vBulletins default install for products? vB Optimise does attempt to flush data on the action, try running a system test to ensure flushing works.
TruthElixirX - Have you selected a cache method? The error will also occur if you've set that to "None" (which it is by default), I should make my error message more elevant.
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