Seems like a lot of folks are (justifiably) getting irritated at not being taken right back to the thread wherein they had just posted, as well as the red message you get telling you that new replies have been made while you've been trying to post yours.
To turn off those annoyances, do as follows:
first, go to your profile page and drill down as follows: Profile-->Modify Profile-->Look and Layout
On that page you'll see two tick boxes, one labelled "Return to topics after posting by default" and the other labelled "Don't warn on new replies made while posting" - make sure those two boxes are checked and you should be good to go.