Phew! Glad it isn't just me (and I tried FF as well, and got the same problem). I have gone through numerous other forums on the net now, and this definitely seems to be a Rendo-specific problem. I guess there aren't that many Mozilla users around or there would have been a lot more noise by now

(Later) yes, I've had the empty 'Reply' box on hitting back as well, but only once so far.

Steve