Well, the same thing's just happened with the above post.
I posted it and it didn't appear.
Go into my history to see if I can find it but it just has the heading of the thread. Clicked on it anyway and there is the above post and that was despite me refreshing the page when it didn't first appear.
We shouldn't have to worry about copying our replies just in case it disappears, because if I'd done that I would have ended up accidentlly duplicating the post