When I view a PM and click "Reply", I get a broken Reply box, with the cursor at the top of the formatting buttons. There is no white box below the formatting buttons to enter my reply. I tried to click in the area above and below the buttons to enter text but to no avail, finally clicked the "REPLY" button at the bottom and saw a "Null" message in the history. I went back to my inbox, clicked on the PM again, replied again and this time it seemed to work. I'm using Mozilla Firefox 3.5.7 on Mac OS X.