Hm.. Which version of vBulletin are we running? I thought double posting prevention option was built in by default since 4.2.x.

(I can't check myself but it should be under Control Panel > Settings > Options > Doublepost Options)



Edit: I found out that I can access the CP. Sweet. And from there I see that we are running 4.2.1. But I guess the settings I'm talking about only are available in "ACP", which I'm assuming is "Admin control panel".