When you write something in the post form, press "enter" a number of times and then click an emoticon, it's not inserted in the last line, where the insertion cursor is positioned, but in the first blank line instead.
It happens only when done exactly as I said. If you press enter many times, move the cursor around with the arrow keys and just then click an emoticon, it works as it's supposed to.
The person who reported this to me is running Google Chrome 220.127.116.11 on Windows XP and I was able to reproduce it on Safari 4.0.2 running on Mac OS X Leopard.
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/530.5 (KHTML, like Gecko) Chrome/18.104.22.168 Safari/530.5
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_7; en-us) AppleWebKit/530.19.2 (KHTML, like Gecko) Version/4.0.2 Safari/530.19