I'm trying to post and get "Sorry, Your request antecedents incorrect or forms authentication string does not match, Can not submit."
What does that mean, and what should I do?

I am getting the same thing when I try to post a new thread for a question I have.  Some help would be nice!

Ok I fixed the issue I was having.  Update your Java and then try again.  Thats what did it for me, good luck!