Yes, it happens to me too. One of a number of glitches here in this forum that have appeared in the last few days.
I just do a copy and paste of the previous message, and then select the text in the new message and click on the quote icon. Annoying to have to use this workaround, but that's what I do.
There's a thread in the Back Room forum about these symptoms -- a number of others observe them too: How quoting posts is working right now . Jive (the forum provider) appears to have a bunch of issues in the last couple of weeks, and two Adobe employees still actively participate in that forum and work with Jive to get the reported issues correct (though it's a slow process -- as we've observed before, Jive often isn't very responsive and has quality issues).
Thanks guys, hopefully this will be fixed soon.