I get his a lot also, though I get it on posts a lot too (though not in the same way). When I'm loading up a new page or thread, the quick reply box shows up as this for a few seconds - It goes back to normal after a few seconds, but on posts this isn't really a problem, I think it's related though. In PMs, if I hit preview message, it will notify me to type something into the message header and such, and when I click 'ok' it will all just disappear and I have to type everything out again. This has only started in the last few weeks. I'm not sure if this would be the cause, I use the fully enhanced Messenger Editor Interface in the options.
