Mine says to click the quick reply button in the post, but it doesn't automatically quote the post in the quick reply box. There is a box you can check below the quick reply text area though that asks if you want to quote the message in the reply.
Are you sure you aren't clicking on the button to the left of quick reply that says "quote+"? That button is for multi-quote. You can click on as many in a thread as you want and then when you click on the regular reply button, it will autoquote all those posts.
Also, you can choose "go advanced" on the quick reply box if you want it to change over to the regular reply box with all the formatting options.
This seems to be functioning exactly as it does on any other forum using vBulletin software. I haven't been posting here long though. Perhaps an admin changed the options in the control panel requiring members to choose a post to quick reply to instead of just allowing quick reply without choosing a post? I'm not sure how you guys had it before, so I don't know if this is just a matter of settings being changed in the admin control panel.