The next step is to disable all Products at Admin CP -> Plugins & Products -> Manage Products -> Disable AND uncheck all the plugins at Admin CP -> Plugins & Products -> Plugin Manager. You must do BOTH of those steps in order to disable all non vBulletin Modifications. Then remove that line from your config.php file and turn on your products one-by-one until replying breaks again and then you will know which modification is causing the issue.
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