Is multi-quote not working, or am I just doing something stupid?

[Dave Britten]

If I click the little multi-quote button (between "Quote" and "Report") on a couple of posts in a thread, then click "New Reply", there aren't any quote blocks inserted into the message body. If I click the "Quote" button on one of the multi-quoted posts, I only get a quote block for that specific post. I could swear this was working before using one of those two procedures.