One thing that I've noticed is that you have to fill in all of the fields including the subject on some of the posting screens otherwise you hit submit and the screen blinks and comes up exactly the same, You think it has posted but it hasn't really. It's come back for you to fill something in but it doesnt tell you so. so you follow a link and go to where you tink it should be and it's gone. That's 'cause it never got there!
Good luck.
It's worth it when you do get there!