Moth. Disappearing posts have been happening to me too, lately, and I have figured out how to deal with it.

Did you get one of those error pages that suggest clicking "refresh"? Well next time, do it, click refresh, then you get a box saying something like: "This page cannot be refreshed without resending." Just click "retry" and your eloquence will be re-sent. Don't be tempted to click "back" otherwise you lose the lot.